ChuyêN ĐỀ tiếng anh

Packet sugar from the supermarket is extracted from (61) __________ sugar cane or sugar beet. These (62) __________ are mixed with hot water, which dissolves their natural sugar. Sugar is also found in fruit some of which, such as dates and grapes, (63) __________ very high amounts of sugar. To be a little more (64) __________, sugar should be called sucrose. Sucrose is made up of two substances, glucose, which (65) __________ for instant energy, and fructose, which lasts longer as a source of energy. The sugar in fruit is mainly fructose. So when we eat fruit, we (66) __________ quite large amounts of natural sugar. Some scientists believe that too much sugar (67) __________ in sweets, cakes, and biscuits. It is said to be generally bad for the health, although nothing (68) __________ so far. However, it (69) __________ that sugar causes tooth decay. As one expert said that “If other foods damaged our body as much as sugar (70) __________ our teeth, they would be banned immediately. ”

Question 62: A. productions B. products C. producers D. producing

Question 63: A. contain B. are containing C. are contained D. contains

Question 64: A. scientists B. scientific C. Science D. non-science

Question 65: A. used B. are using C. use D. is used

Question 66: A. are also eaten B. have been eaten C. also eat D. will be eaten

Question 67: A. is eaten B. eats C. has eaten D. will eat

Question 68: A. is proving B. has proved C. has been proved D. were proved

Question 69: A. knows B. has known C. is knowing D. is known

Question 70: A. damages B. did C. decayed D. effect

Millions of people are using cell phones today. In many places, it is actually considered unusual not to use one. In many countries, cell phones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected.

The explosion in mobile phone use around the world has made some health professionals worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.

On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't agree.

What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.

Question 71: According to the passage, cell phones are especially popular with young people because....................

A. they are indispensable in everyday communications.

B. they make them look more stylish.

C. they keep the users alert all the time.

D. they cannot be replaced by regular phones.

Question 72: The word "means" in the passage most closely means....................

A. poor ideas about the effects of cell phones.

B. widespread opinion about bad effects of cell phones.

C. information on the lethal effects of cell phones.

D. the negative public use of cell phones.

Question 75: The changes possibly caused by the cell phones are mainly concerned with....................

A. only use mobile phones in urgent cases. B. keep off mobile phones regularly.

C. never use mobile phones in all cases. D. only use mobile phones in medical emergencies.

Question 80: The most suitable title for the passage could be....................

A. “Mobile Phones: A Must of Our Time” B. “Technological Innovations and Their Price”.

C. “The Way Mobile Phones Work”. D. “The Reasons Why Mobile Phones Are Popular”.

1C 2D 3C 4B 5B 6D 7D 8B 9B 10D

11C 12C 13C 14A 15A 16A 17B 18A 19A 20D

21C 22D 23D 24B 25A 26D 27D 28B 29C 30A

31A 32D 33C 34B 35C 36B 37B 38C 39B 40D

41A 42A 43D 44C 45D 46D 47C 48C 49A 50D

51A 52A 53B 54C 55D 56A 57C 58A 59B 60B

61C 62B 63A 64B 65D 66C 67A 68C 69D 70A

71B 72D 73A 74B 75A 76A 77D 78D 79A 80B