K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

2 tháng 11 2023

1 energy

2 on

3 If

4 make

5 but

6 in

7 was

8 unless

giúp mik với T^T II. Read the following passage and choose the correct answer. The search for alternative sources of energy has led in various directions. Many communities are burning garbage and other biological waste products to produce electricity. Converting waste products to gases or oil is also an efficient way to dispose of waste. Experimental work is being done to derive synthetic fuels from coal, oil shale and coal tars. But to date, that process has proven expensive. Other...
Đọc tiếp

giúp mik với T^T

II. Read the following passage and choose the correct answer.
The search for alternative sources of energy has led in various directions. Many
communities are burning garbage and other biological waste products to produce
electricity. Converting waste products to gases or oil is also an efficient way to dispose of
waste.
Experimental work is being done to derive synthetic fuels from coal, oil shale and coal tars.
But to date, that process has proven expensive. Other experiments are underway to
harness - power with giant windmills. Geothermal power, heat from the earth, is also being
tested.
Some experts expect utility companies to revive hydroelectric power derived from streams
and rivers. Fifty years ago hydroelectric power provided one third of the electricity used in
the United States, but today it supplies only four percent. The oceans are another potential
source of energy. Scientists are studying ways to convert the energy of ocean currents,
tides, and waves to electricity. Experiments are also underway to make use of the
temperature differences in ocean water to produce energy.
1. Which is the best title of the passage?
A. Efficient Ways of Disposing of Waste B. The Use of Water Productions for
Energy
C. The Search for Alternative Sources of Energy D. New Discoveries in Geothermal Power
2. In the second paragraph, the phrase “synthetic fuels” could best be replaced by which of
the following?
A. Biological fuels B. Low burning fuels C. Fast burning fuels D. Artificial
made fuels
3. Which of the following is NOT mentioned in the passage as an alternative source of
energy?
A. Burning of garbage B. Geothermal power C. Synthetic fuels
D. Electricity
4. According to the author, the impracticability of using coal, oil shale and coal tars as
sources of energy is due to ___________ .
A. their being time consuming B. their being money consuming

C. the scarcity of sources D. the lack of technology their being
money consuming
5. The word “it” in the last paragrph refers to ____.
A. alternative source B. the United States C. hydroelectric power D. Electricity
6. What can be inferred from the last paragraph?
A. Hydroelectric power will be the main source of energy
B. Synthetic fuels will be the principal source of alternative energy
C. Alternative energy will come from a variety of sources
D. All alterenative production of energy will be delivered from water.

0
27 tháng 2 2020

plentiful

environmentally

pollution

unfortunately

economically

alternative

power (từ này ko chắc)

transportations

produce

cheaper

II. Choose the word which has the underlined part pronounced differently from the rest.Question 6. A. recycle B. medical C. chemical D. athleticQuestion 7. A. pollute B. botanic C. contaminate D. economyQuestion 8. A. into B. history C. tiny D. diseaseIII. Choose the word which is stressed differently from the rest.Question 9. A. national B. grammatical C. medical D. chemicalQuestion 10. A. athletic B. historic C. dramatic D. classicQuestion 11. A. scientifically B. economic C. artistic D....
Đọc tiếp

II. Choose the word which has the underlined part pronounced differently from the rest.
Question 6. A. recycle B. medical C. chemical D. athletic
Question 7. A. pollute B. botanic C. contaminate D. economy
Question 8. A. into B. history C. tiny D. disease
III. Choose the word which is stressed differently from the rest.
Question 9. A. national B. grammatical C. medical D. chemical
Question 10. A. athletic B. historic C. dramatic D. classic
Question 11. A. scientifically B. economic C. artistic D. scientific
IV. Choose the correct answer to complete each sentence.
Question 12. Water pollution can put negative __________ on our health.
A. contamination B. affects C. effects D. problems
Question 13. A: How can light pollution __________ animals?
B: It can make animals change their behavior patterns.
A. cause B. make C. affect D. lead
Question 14. The dove is a universal __________ of peace.
A. symbolizing B. symbolize C. symbolic D. symbol
Question 15. The city has an atmosphere which is quite __________. You will never feel like that in other
places.
A. important B. normal C. unique D. common
Question 16. __________ about the storm that stroke Hanoi last night?
A. Did you hear B. Do you heard C. Have you hear D. Did you heard
Question 17. Many people __________ because of the earthquake last week.
A. did injure B. injured C. have injured D. were injured
Question 18. When I looked at the river, I knew it __________ for a long time.
A. had contaminated B. had been contaminated
C. was contaminated D. contaminated
Question 19. All flights to Ha Noi had to be cancelled __________ the storm.
A. as a result B. due to C. because D. so
Question 20. When we were young, we __________ in the river near our home.
A. used to swim B. have swum C. had swum D. were swimming
V. Find a mistake in each sentence.
Question 21. My father worked (A) in a noisy factory for (B) a long time, since (C) he suffered from hearing
loss (D).
Question 22. The River Thames flows (A) through southern (B) England and connect (C) London with (D)
the sea.
Question 23. Much (A) of the town was reconstruct (B) after (C) the tornado (D).
Question 24. Look at (A) those (B) grey clouds! It will (C) rain soon (D).
Question 25. Students might (A) only use the (B) laboratory once (C) a (D) week.
VI. Read the passge. And decide if the following statements are true (T) or false (F).

Living in Scotland

Scotland is the UK’s most northern country and has around 790 islands off its coasts – 130 of which
have people living on them. Scotland is well known for its stunning landscapes, beautiful beaches and lochs,
which are fress water lakes. There are over 600 square miles of lochs in Scotland including the most famous
one, Loch Ness.
It has a population of just over five million people which is about 8.5 per cent of the whole UK
population. Over 2 milion of these live in Glasgow and Edinburgh, and almost half of Scotland’s population
live in the Central Belt, where both the largest city (Glasgow), and the capital city Edinburgh) are located.
Scotland also hostsone of the biggest arts festivals in the world. This is commonly known as the
Edinburgh Festival but is actually made up of a number of different festivals which happen at different times
of the year, though many do take place in August and September. Many people have heard of the Fringe
Festival, but there are also the International Festival, the Film Festival, the Children’s Festival and the
Edinburgh Mela which is an intercultural festival.
Question 26. Scottish people inhabit on over 1/6 of its all islands. __________
Question 27. Scotland’s population is over 1/10 of the whole UK population. __________
Question 28. People in Scotland prefer living in other areas to big cities. __________
Question 29. There are 2 common months for Edinburgh Festival. __________
Question 30. There won’t be any special events exclusively for kids in this Festival. __________
VII. Read the passage and answer the questions.
Technology has advanced to the point where instant communication anywhere in the world is an
everyday fact of life. Technology has improved, and has a positive impact on communication as a whole in
many (31) __________ . It has increased the reliability of sending messages to others, made it easier to meet
new people and keep (32) __________ touch with friends.
Modern communication is handled by wireless signals, undersea cables, satellites and other (33)
__________ technology, ensuring the fast delivery of messages and data to any locations. The accessibility of
technology also means that you don’t need to be in any special locations like a post office or mail room to
send a message; all you need is a cell phone.
Online communication has (34) __________ the door to new ways of communicating with strangers and
taking part in communities. Chat rooms, (35) __________ forums and dating sites let people meet each other
and get to know more people without having to be there in person.
Question 31. A. methods B. means C. forms D. ways
Question 32. A. on B. out C. for D. in
Question 33. A. advanced B. high C. simple D. basic
Question 34. A. opened B. closed C. been opened D. been closed
Question 35. A. channel B. discussion C. cyber D. media
VIII. Choose the best sentence that can be made from the cues given.
Question 36. We/ use/ art/ communicate/ 200 years.
A. We will be using art to communicate in 200 years.
B. We will use art for communicating for 200 years.
C. We will have used art to communicating in 200 years.
D. We will be using art for communicating by 200 years.
Question 37. I/ look forward to/ hear/ you/ soon.
A. I am looking forward to hearing from you soon.
B. I am looking forward to hear from you soon.
C. So am I looking forward to hear from you soon.
D. I look forward to hear from you soon.
Question 38. The number/ English speakers/ increase/ recent years.
A. The number of English speakers increase in recent years.
B. The number of English speakers have increased in recent years.
C. The number of English speakers increased in recent years.
D. The number of English speakers has increased in recent years.

Question 39. According/ latest report/ the number/ people/ injured/ typhoon/ nearly/ 150.
A. According to the latest report, the number of people injured in the typhoon was nearly 150.
B. According to the latest report, the number of people were injured in the typhoon were nearly 150.
C. According to lastest, the number of people injured in the typhoon were nearly 150.
D. According to the lastest report, the number of people have injured in the typhoon was nearly 150.
Question 40. Tsunamis/ also/ refer/ the public/ tidal waves.
A. Tsunamis also referred to the public as tidal waves.
B. Tsunamis also refer to the public as tidal waves.
C. Tsunamis is also referred as the public as tidal waves.
D. Tsunamis are also referred to the public as tidal waves.
_________THE END___________

4
12 tháng 6 2019

II. Choose the word which has the underlined part pronounced differently from the rest.
Question 6. A. recycle B. medical C. chemical D. athle
Question 7. A. pollute B. botanic C. contaminate D. economy
Question 8. A. into B. history C. tiny D. disease
III. Choose the word which is stressed differently from the rest.
Question 9. A. national B. grammaal C. medical D. chemical
Question 10. A. athle B. historic C. drama D. classic
Question 11. A. scientifically B. economic C. artis D. scientific

12 tháng 6 2019

IV. Choose the correct answer to complete each sentence.
Question 12. Water pollution can put negative __________ on our health.
A. contamination B. affects C. effects D. problems
Question 13. A: How can light pollution __________ animals?
B: It can make animals change their behavior patterns.
A. cause B. make C. affect D. lead
Question 14. The dove is a universal __________ of peace.
A. symbolizing B. symbolize C. symbolic D. symbol
Question 15. The city has an atmosphere which is quite __________. You will never feel that in other
places.
A. important B. normal C. unique D. common
Question 16. __________ about the storm that stroke Hanoi last night?
A. Did you hear B. Do you heard C. Have you hear D. Did you heard
Question 17. Many people __________ because of the earthquake last week.
A. did injure B. injured C. have injured D. were injured
Question 18. When I looked at the river, I knew it __________ for a long time.
A. had contaminated B. had been contaminated
C. was contaminated D. contaminated
Question 19. All flights to Ha Noi had to be cancelled __________ the storm.
A. as a result B. due to C. because D. so
Question 20. When we were young, we __________ in the river near our home.
A. used to swim B. have swum C. had swum D. were swimming
V. Find a mistake in each sentence.
Question 21. My father worked (A) in a noisy factory for (B) a long time, since (C) he suffered from hearing
loss (D).
Question 22. The River Thames flows (A) through southern (B) England and connect (C) London with (D)
the sea.
Question 23. Much (A) of the town was reconstruct (B) after (C) the tornado (D).
Question 24. Look at (A) those (B) grey clouds! It will (C) rain soon (D).
Question 25. Students might (A) only use the (B) laboratory once (C) a (D) week.

Exercise 1. Underline the most suitable future form in each sentences.Why are you going to buy / will you buy a new mountain bike?Don’t phone between 8.00 and 9.00. I’ll study / I’ll been studying then.Look out! That tree will / is going to fall.Let me know as soon as Louis will get / gets here.Great news! Jean and Chris will come/ are coming to stay with us.According to this timetable, the bus is going to arrive/ arrives at 6.00.Can you call me at this evening, because I’ll / I’m...
Đọc tiếp

Exercise 1. Underline the most suitable future form in each sentences.
Why are you going to buy / will you buy a new mountain bike?
Don’t phone between 8.00 and 9.00. I’ll study / I’ll been studying then.
Look out! That tree will / is going to fall.
Let me know as soon as Louis will get / gets here.
Great news! Jean and Chris will come/ are coming to stay with us.
According to this timetable, the bus is going to arrive/ arrives at 6.00.
Can you call me at this evening, because I’ll / I’m leaving tomorrow.
If you arrive late at the sale, the best thing will go / will have gone.
Exercise 2. Put each verb in brackets into a suitable future form.
By the time we reach home, the rain ...........................(stop).
This time next week I (lie).................................. on the beach in Spain.
In ten years’ time I (work)..................................... for a different company.
If we don’t get there by 6.00, Jack (leave).............................................
In July they (be married)...................................... for 20 years.
In the year 2500 a lot of people (live) ......................................on the Moon.
When you get to the station, I (wait)...................................... for you outside.
Don’t worried! The plane (land)............................................ in a moment.
By the time you come home, I (finish).................................... the decorating.
Come round between 8 and 9. We (watch)................................................. the match on TV then.
Exercise 3. Put each verb in brackets into a suitable future form.
When I (see)................................ you tomorrow, I (tell)......................................... you my news.
As soon as we (get).................................... there, we (phone)................................................ for a taxi.
I (go)................................................ to the library before I (do) ............................................the shopping.
We (wait) .................................. here until the rain (stop)...........................................
I (get).................................... £50 from the bank when it (open).........................................
After you (take)...................................... the medicine, you (feel)...................................... better.
You have to stay until you (finish)....................................... your work.
I (let).................................. you know the minute I (hear) .......................................... the results.
Before we (paint).......................................... the wall, we (have)............................................. a cup of tea.
We (climb)......................................... over the wall as soon as it (get)................................................. dark.
Exercise 4. Put each verb in brackets into a suitable future form.
Have you ever wondered what exactly (1)....................................(you do) in ten years time? Well, according to the computer expert Tom Vincent, computer (2).........................................(soon be able) to make accurate predictions about the future. Professor Vincent, from Cambridge,(3)....................................... (hold) a press conference next week to describe the computer which he calls “the Computafuture”. “This computer can tell us what life(4)....................................... (be) like, based on data describing last events”, explains Professor Vincent. For example, Computafuture can predict how many people(5).................................. (live) in a particular area, or whether there(6).................................. (be) a lot of rain during a particular period. Professor Vincent also believes that by the year 2050, computer (7).....................................(replace) teachers, and (8)...................................(also do) most of the jobs now being done by the police. “Computer are becoming intelligent all the time”, says Professor Vincent. Soon they (9)...............................(direct) traffic and(10).............................................. (teach) our children. And telling us about the future.”
 

1
1 tháng 8 2018

Exercise 1. Underline the most suitable future form in each sentences.
Why are you going to buy / will you buy a new mountain bike?
Don’t phone between 8.00 and 9.00. I’ll study / I’ll been studying then.
Look out! That tree will / is going to fall.
Let me know as soon as Louis will get / gets here.
Great news! Jean and Chris will come/ are coming to stay with us.
According to this timetable, the bus is going to arrive/ arrives at 6.00.
Can you call me at this evening, because I’ll / I’m leaving tomorrow.
If you arrive late at the sale, the best thing will go / will have gone.
Exercise 2. Put each verb in brackets into a suitable future form.
By the time we reach home, the rain will have stopped (stop).
This time next week I (lie) will be lying on the beach in Spain.
In ten years’ time I (work). will be working for a different company.
If we don’t get there by 6.00, Jack (leave) will leave
In July they (be married). will have been married for 20 years.
In the year 2500 a lot of people (live) will be living on the Moon.
When you get to the station, I (wait) will be waiting for you outside.
Don’t worried! The plane (land) will be landing/ will land/ is going to land in a moment.
By the time you come home, I (finish) will have finished. the decorating.
Come round between 8 and 9. We (watch). will be watching the match on TV then.
Exercise 3. Put each verb in brackets into a suitable future form.
When I (see) see you tomorrow, I (tell) will tell  you my news.
As soon as we (get) get there, we (phone) will phone for a taxi.
I (go) will go to the library before I (do) do the shopping.
We (wait) will wait here until the rain (stop) stops
I (get) will get. £50 from the bank when it (open) open
After you (take) take the medicine, you (feel) will feel better.
You have to stay until you (finish) have finished your work.
I (let) will let you know the minute I (hear) hear the results.
Before we (paint) paint the wall, we (have).will have a cup of tea.
We (climb) will climb over the wall as soon as it (get) gets dark.
Exercise 4. Put each verb in brackets into a suitable future form.
Have you ever wondered what exactly (1) you will be doing (you do) in ten years time? Well, according to the computer expert Tom Vincent, computer (2) will be soon able  (soon be able) to make accurate predictions about the future. Professor Vincent, from Cambridge,(3) will hold (hold) a press conference next week to describe the computer which he calls “the Computafuture”. “This computer can tell us what life(4) will be (be) , based on data describing last events”, explains Professor Vincent. For example, Computafuture can predict how many people(5) will live (live) in a parular area, or whether there(6) will be (be) a lot of rain during a parular period. Professor Vincent also believes that by the year 2050, computer (7) will have replaced (replace) teachers, and (8) will also be doing (also do) most of the jobs now being done by the police. “Computer are becoming intelligent all the time”, says Professor Vincent. Soon they (9) will be directing .(direct) traffic and(10) teaching (teach) our children. And telling us about the future.”

27 tháng 2 2020

Tidal energy is renewable plentiful and clean -Wind will be used as an environmental friendly sources of energy . -There are many ways will be used to solve the problem of pollution

Chỉ biết từng đó hoi à! Thông cảm nha!

27 tháng 2 2020

ờ, mà sáng mai bạn học hay ntn mà có vẻ gấp vậy?

III. Complete the following passage by filling one word for each blank.If there is just one single thing more astonishing than the ability of the adult human being to talk, it is the process by which someone learns to do this. Some parts of the process are still (1)________ much a closed book, but it is for the (2)_________ part possible to describe what the child is doing at various stages in its development, even if we cannot account (3)________ how exactly it learns to do these things.In...
Đọc tiếp

III. Complete the following passage by filling one word for each blank.

If there is just one single thing more astonishing than the ability of the adult human being to talk, it is the process by which someone learns to do this. Some parts of the process are still (1)________ much a closed book, but it is for the (2)_________ part possible to describe what the child is doing at various stages in its development, even if we cannot account (3)________ how exactly it learns to do these things.

In fact, research carried out by various linguists has (4)_________ rise to as many theories as there are differences in the rate of development. A baby actually makes sounds from the moment it is born, but for some time these are rather far removed (5)_________ articulate speech. In something like a year, a baby will probably be at a stage where one or two syllables represent the peak of its achievement as a speaker; one more year and it will be (6)_______ out with short phrases, and after this it seems (7)________ time at all before the child is capable of uttering complete sentences.

    Despite being a truly remarkable feat of learning, this is one that is performed by the vast (8)_________ of human beings. Complex operations are brought (9)________ play in these dealing with speech and language; the key (10)_______ in brain work, though tongue – work and ear – work play a part in the whole process.

 

1
11 tháng 8 2020

If there is just one single thing more astonishing than the ability of the adult human being to talk, it is the process by which someone learns to do this. Some parts of the process are still (1)___quite_____ much a closed book, but it is for the (2)____visible_____ part possible to describe what the child is doing at various stages in its development, even if we cannot account (3)___for_____ how exactly it learns to do these things.

In fact, research carried out by various linguists has (4)___given______ rise to as many theories as there are differences in the rate of development. A baby actually makes sounds from the moment it is born, but for some time these are rather far removed (5)_____by____ arulate speech. In something a year, a baby will probably be at a stage where one or two syllables represent the peak of its achievement as a speaker; one more year and it will be (6)___better____ out with short phrases, and after this it seems (7)________ time at all before the child is capable of uttering complete sentences.

    Despite being a truly remarkable feat of learning, this is one that is performed by the vast (8)___diversity______ of human beings. Complex operations are brought (9)________ play in these dealing with speech and language; the key (10)_______ in brain work, though tongue – work and ear – work play a part in the whole process

IV. In the following text, six sentences or parts of sentences have been removed. Above the extract you will find the six removed sentences PLUS one sentence which doesn't fit. Choose from the sentences (A-G) the one which fits each gap (1-6). Remember, there is one extra sentence you do not need to use. Write the correct letter in the box. Choose from the following sentences to fill the spaces in the text. There is ONE extra. A. Using a microwave for cooking a large food mass is difficult...
Đọc tiếp

IV. In the following text, six sentences or parts of sentences have been removed. Above
the extract you will find the six removed sentences PLUS one sentence which doesn't fit.
Choose from the sentences (A-G) the one which fits each gap (1-6). Remember, there is
one extra sentence you do not need to use. Write the correct letter in the box.
Choose from the following sentences to fill the spaces in the text. There is ONE extra.
A. Using a microwave for cooking a large food mass is difficult due to limited penetration of
microwaves.
B. This can be overcome by leaving the food to stand for a few minutes when cooking is
completed.

C. It is advised that the water should be poured slowly into another container that already
contains the powder.
D. In this way, buying a microwave oven with a turntable ensure the food is cooked
throughout.
E. Conversely the microwaves do not heat glass, ceramic and plastic containers.
F. If the microwaves are not absorbed inside the oven, the oven can be damaged by
electrical arcs and overheating of the microwave source.
G. When water in that state is disturbed, it can suddenly and unexpectedly boil violently.
MICROWAVING
Microwaving is a method of cooking where food is bombarded by microwaves, usually
within an appliance called a microwave oven which excite the water, fat and sugar
molecules, thereby heating (cooking) both the outside and center of the food at the same
time. (1)…………………
(A common myth is that a microwave oven cooks from the center of the food outward. This
appears to happen because heat generated at the surface escapes more readily from the
surface of the food into the surrounding air.) One advantage of microwaving is that small
amounts of food can be heated very quickly, making it useful for reheating leftovers.
The disadvantage is that food which is microwaved does not undergo some of the chemical
reactions, such as browning, which makes the food visually attractive. Primitive microwave
ovens often do not cook evenly, leading to a concern that bacteria easily killed by more
traditional cooking methods may survive the quick cooking time in "cold spots", though the
food item as a whole is cooked to a safe average temperature. (2) ……
Some high-end microwave ovens are combined with a convection oven which basically
cook the food using microwave and hot air simultaneously to achieve both the fast cooking
time and browning effect.
(3) …………………
However microwave ovens are used in some fast food chains and special microwave bags
are available for cooking fowl or large joints of meat.
Professional chefs generally recommend using microwaves for a limited set of tasks,
including: melting fats (such as butter) and chocolate, cooking grains like oatmeal and grits,
cooking rice, thawing frozen meats and vegetables before cooking by other methods and
quickly reheating already-cooked foods.
Using a microwave to boil water is potentially dangerous, due to superheating. In a
microwave, water can be raised quickly to a temperature above the boiling point before
major bubbles form, especially if it is purified and in a very clean glass vessel. (4)
…………………
This effect is rare, even for scientists who try to deliberately recreate it, and any seed
whatsoever for boiling is likely to prevent the problem. Boiling water with, for instance, a
teabag already in it will prevent any dangers by providing a seed, as will using a mug that is
not perfectly clean.

The risk greatly increases when water has already been boiled once in the same container.
This situation can occur if the user of the oven boiled the water once, forgot about it, then
came back later to boil it again. The first time the water boils, the seed bubbles
(microscopic bubbles of air around which larger steam bubbles grow) are used up and
largely eliminated from the water as it cools down. When the water is heated again, the lack
of seed bubbles causes superheating, and a risk of a steam explosion when the water's
surface is disturbed.
Placing something in the water before heating can mostly alleviate this risk. If you are
planning to mix something with the water, say tea or hot chocolate, adding it before heating
will insure that the water boils. Otherwise, placing a wood object, for instance a chopstick,
in the water before heating will also work.
Care should be taken when removing heated water from a microwave. Make sure that the
hands are protected from possible liquid boil-over, place the container on a level, heat-
proof surface and stir liquid with a warm spoon. Also, never add powdered substances
(such as instant coffee or cocoa mix) to the container taken from the microwave, due to the
addition of all those seed bubbles and the potential for violent, spontaneous boiling. (5)
…………………
Metal objects, such as metal utensils, in a microwave oven can lead to dangerous situations.
Metals do not absorb microwaves effectively. Instead, metals reflect microwaves, thereby
preventing the latter from reaching the food. (6) …………………
Thin metal layers, such as metal foil and mugs with metal trim can melt or burn due to the
strong electrical currents that are generated in metal objects. However, small solid metal
objects, such as spoons, in combination with a large amount of absorbing food or liquid,
normally do not lead to problems.
This article is licensed under the GNU Free Documentation License. It uses material from the
Original Wikipedia article.

3
21 tháng 2 2020

IV. In the following text, six sentences or parts of sentences have been removed. Above
the extract you will find the six removed sentences PLUS one sentence which doesn't fit.
Choose from the sentences (A-G) the one which fits each gap (1-6). Remember, there is
one extra sentence you do not need to use. Write the correct letter in the box.
Choose from the following sentences to fill the spaces in the text. There is ONE extra.
A. Using a microwave for cooking a large food mass is difficult due to limited penetration of
microwaves.
B. This can be overcome by leaving the food to stand for a few minutes when cooking is
completed.

C. It is advised that the water should be poured slowly into another container that already
contains the powder.
D. In this way, buying a microwave oven with a turntable ensure the food is cooked
throughout.
E. Conversely the microwaves do not heat glass, ceramic and plastic containers.
F. If the microwaves are not absorbed inside the oven, the oven can be damaged by
electrical arcs and overheating of the microwave source.
G. When water in that state is disturbed, it can suddenly and unexpectedly boil violently.
MICROWAVING
Microwaving is a method of cooking where food is bombarded by microwaves, usually
within an appliance called a microwave oven which excite the water, fat and sugar
molecules, thereby heating (cooking) both the outside and center of the food at the same
time. (1)………E…………
(A common myth is that a microwave oven cooks from the center of the food outward. This
appears to happen because heat generated at the surface escapes more readily from the
surface of the food into the surrounding air.) One advantage of microwaving is that small
amounts of food can be heated very quickly, making it useful for reheating leftovers.
The disadvantage is that food which is microwaved does not undergo some of the chemical
reactions, such as browning, which makes the food visually attractive. Primitive microwave
ovens often do not cook evenly, leading to a concern that bacteria easily killed by more
traditional cooking methods may survive the quick cooking time in "cold spots", though the
food item as a whole is cooked to a safe average temperature. (2) …B
Some high-end microwave ovens are combined with a convection oven which basically
cook the food using microwave and hot air simultaneously to achieve both the fast cooking
time and browning effect.
(3) ………A…………
However microwave ovens are used in some fast food chains and special microwave bags
are available for cooking fowl or large joints of meat.
Professional chefs generally recommend using microwaves for a limited set of tasks,
including: melting fats (such as butter) and chocolate, cooking grains like oatmeal and grits,
cooking rice, thawing frozen meats and vegetables before cooking by other methods and
quickly reheating already-cooked foods.
Using a microwave to boil water is potentially dangerous, due to superheating. In a
microwave, water can be raised quickly to a temperature above the boiling point before
major bubbles form, especially if it is purified and in a very clean glass vessel. (4)
………G…………
This effect is rare, even for scientists who try to deliberately recreate it, and any seed
whatsoever for boiling is likely to prevent the problem. Boiling water with, for instance, a
teabag already in it will prevent any dangers by providing a seed, as will using a mug that is
not perfectly clean.

The risk greatly increases when water has already been boiled once in the same container.
This situation can occur if the user of the oven boiled the water once, forgot about it, then
came back later to boil it again. The first time the water boils, the seed bubbles
(microscopic bubbles of air around which larger steam bubbles grow) are used up and
largely eliminated from the water as it cools down. When the water is heated again, the lack
of seed bubbles causes superheating, and a risk of a steam explosion when the water's
surface is disturbed.
Placing something in the water before heating can mostly alleviate this risk. If you are
planning to mix something with the water, say tea or hot chocolate, adding it before heating
will insure that the water boils. Otherwise, placing a wood object, for instance a chopstick,
in the water before heating will also work.
Care should be taken when removing heated water from a microwave. Make sure that the
hands are protected from possible liquid boil-over, place the container on a level, heat-
proof surface and stir liquid with a warm spoon. Also, never add powdered substances
(such as instant coffee or cocoa mix) to the container taken from the microwave, due to the
addition of all those seed bubbles and the potential for violent, spontaneous boiling. (5)
…………C………
Metal objects, such as metal utensils, in a microwave oven can lead to dangerous situations.
Metals do not absorb microwaves effectively. Instead, metals reflect microwaves, thereby
preventing the latter from reaching the food. (6) …………F………
Thin metal layers, such as metal foil and mugs with metal trim can melt or burn due to the
strong electrical currents that are generated in metal objects. However, small solid metal
objects, such as spoons, in combination with a large amount of absorbing food or liquid,
normally do not lead to problems.
This article is licensed under the GNU Free Documentation License. It uses material from the
Original Wikipedia article.

21 tháng 2 2020

Nguyễn Bích Ngọc ngô mai phương một tip nhỏ cho 2 e khi làm bài này đúng ra là nên đọc hết cả bài nhưng mà cj thấy bài này sử dụng từ vựng khá là đơn giản thôi nên chỉ cần đọc câu trước và câu phía sau câu chỗ cần điền các e có thể đoán ra phần nào cho chắc ăn các e có thể đọc lại đoạn đó sau khi chọn. < chỉ bài này thôi là đọc câu trước và câu sau là tìm dduocj thôi chứ cj ko chắc là bài nào cũng vậy nah >