It is clear that some chemicals can damage the health of animals and humans. (1) , this is not the only problem that (2) be caused by the careless use of chemicals. Chemicals can also (3) the ecological balance of the environment. If the ecological balance is disturbed, the results can be (4) serious.The (5) of DDT illustrates the problem. DDT, a chemical which kills insects, at first seemed to be a perfect answer (6) many problems. It would control insects that caused dangerous diseases, (7) insects that caused billions of dollars of damage to crops every year. Governments permitted and even (8) the use of DDT. Farmers in many countries (9) to spray it on their crops. The (10) results were good. Damage to crops (11) down, and profits went up. However, the chemical had effects which the scientists didn’t see in (12) . First, it also killed insects which were the (13) enemies of the harmful insects and which were therefore beneficial to farmers. Second, and perhaps worse, DDT did not kill (14) harmful insect. A few insects had natural resistance to the chemical. They (15) and reproduced in large numbers. In a few years there were large numbers of insects which were not (16) by DDT, and there were (17) insects which Could act as natural (18) on these new "super-insects". Finally, it became clear that DDT was not solving the insect problem. In fact, it was making the problem worse. It (19) became necessary to find a second (20) for the effects of the first.

第（16）空应选择（）

A:effected B:affected C:damaged D:killed

Passage One
There was a nasty (肮脏的，卑鄙的) accident in our town not long ago, and I saw it happen. I was standing near a road which was under repair, not doing anything special—just watching the men at work. It was not far from the new motorway (高速公路) that runs past the town. It was an old road that used to be very busy—and dangerous before the motorway was built. Today, most cars use the new "superhighway" and the old road is pretty quiet, although cars do often come off the motorway into the town faster than they should.
Anyway, the men were repairing part of the road and there were signs up for at least 200 meters, telling everybody that the road was narrower than usual. Most of the drivers in both directions saw the signs and slowed down.
Then three cars came along close together, the third one moving at a very high speed. The first one pas sed the workmen and wanted to turn left. Meanwhile the third car came flying past the second one. The sec and car stopped. I think the driver knew something was going to happen. It did. The third car had no chance of stopping. Its driver braked (刹车) and pulled over to miss the first car and went right off the road.
There were four people in that car: a man, two women and a child. The child was a boy of nine. I read later that they were going shopping—just shopping, nothing more important than that. The driver was badly hurt. The little bay was hurt too. Both the women were killed immediately. One of them was the driver’s wife and the other was the mother of the little boy. They never got to the shops.

The driver who caused the accident （）

A:drove very, very fast B:killed another driver C:killed himself D:both A and C

"Ten people are said to have been killed in the accident” could be rewritten as（）

A:It is said that ten people are killed in the accident. B:It was said that ten people were killed in the accident. C:It was said that ten people had been killed in the accident. D:It is said that ten people were killed in the accident.

? ?Influenza has been with us a long time. According ?(51) ? some Greek writers on medical history, the outbreak of 412 B.C. was of influenz

• a. The same has been suggested of the sickness that swept through the Greek army ?(52) ? Syracuse in 395B.C. Flu is a disease that moves most quickly among people ?(53) ? in crowded conditions, hence, it is likely to attack armies.
  ? ?During the nineteenth century there were five widespread ?(54) ? of influenza. The last of the five ?(55) ? in 1889 and marked the beginning of the story of influenza in our time. Like the ?(56) ? started in Asia.
  ? ?For more than forty years before that outbreak, influenza had steadily ?(57) ? and was believed to be dying out. A new group of outbreaks was introduced by the great outbreak of 1889-1890 and for the next quarter of a century flu ?(58) ? a constant threat.
  ? ?In April 1918 flu broke out among American troops stationed in France. It quickly spread through all the armies but caused relatively ?(59) ? deaths. Four months later, ?(60) ?, a second outbreak started which proved to be a killer. It killed not only the old and already sick but also ?(61) ? young adults. It went through every country in the world, only a few distant islands in the South Atlantic and the Pacific remaining ?(62) ?. It brought the life of whole countries ?(63) ?, food supplies stopped and work loss was very great. Before the great outbreak ended, it ?(64) ? at least 15 million people. Thereafter there have been several great outbreaks throughout the world. It is thus ?(65) ? that influenza is a terrible infection that we have to pay more attention to.

A:killed B:has killed C:had killed D:has been killing

Influenza has been with us a long time. According (51) some Greek writers on medical history, the outbreak of 412 B. C. was of influenz

• a. The same has been suggested of the sickness that swept through the Greek army (52) Syracuse in 395B.C. Flu is a disease that moves most quickly among people (53) in crowded conditions, hence, it is likely to attack armies.
  During the nineteenth century there were five widespread (54) of influenza. The last of the five (55) in 1889 and marked the beginning of the story of influenza in our time. Like the recent outbreak, (56) started in Asia.
  For more than forty years before that outbreak, influenza had steadily (57) and was believed to be dying out. A new group of outbreaks was introduced by the great outbreak of 1889-1890 and for the next quarter of a century flu (58) a constant threat.
  In April 1918 flu broke out among American troops stationed in France. It quickly spread through all the armies but caused relatively (59) deaths. Four months later, (60) , a second outbreak started which proved to be a killer. It killed not only the old and already sick but also (61) young adults. It went through every country in the world, only a few distant islands in the South Atlantic and the Pacific remaining. (62) . It brought the life of whole countries (63) , food supplies stopped and work loss was very great. Before the great outbreak ended, it (64) at least 15 million people. Thereafter there have been several great outbreaks throughout the world. It is thus (65) that influenza is a terrible infection that we have to pay more attention to.

A:killed B:has killed C:had killed D:has been killing

? ?阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。

A:produced B:killed C:helped D:spread

It is clear that some chemicals can damage the health of animals and humans. (1) , this is not the only problem that (2) be caused by the careless use of chemicals. Chemicals can also (3) the ecological balance of the environment. If the ecological balance is disturbed, the results can be (4) serious.The (5) of DDT illustrates the problem. DDT, a chemical which kills insects, at first seemed to be a perfect answer (6) many problems. It would control insects that caused dangerous diseases, (7) insects that caused billions of dollars of damage to crops every year. Governments permitted and even (8) the use of DDT. Farmers in many countries (9) to spray it on their crops. The (10) results were good. Damage to crops (11) down, and profits went up. However, the chemical had effects which the scientists didn’t see in (12) . First, it also killed insects which were the (13) enemies of the harmful insects and which were therefore beneficial to farmers. Second, and perhaps worse, DDT did not kill (14) harmful insect. A few insects had natural resistance to the chemical. They (15) and reproduced in large numbers. In a few years there were large numbers of insects which were not (16) by DDT, and there were (17) insects which Could act as natural (18) on these new "super-insects". Finally, it became clear that DDT was not solving the insect problem. In fact, it was making the problem worse. It (19) became necessary to find a second (20) for the effects of the first.

第（16）空应选择（）

A:effected B:affected C:damaged D:killed

It is clear that some chemicals can damage the health of animals and humans. (1) , this is not the only problem that (2) be caused by the careless use of chemicals. Chemicals can also (3) the ecological balance of the environment. If the ecological balance is disturbed, the results can be (4) serious.The (5) of DDT illustrates the problem. DDT, a chemical which kills insects, at first seemed to be a perfect answer (6) many problems. It would control insects that caused dangerous diseases, (7) insects that caused billions of dollars of damage to crops every year. Governments permitted and even (8) the use of DDT. Farmers in many countries (9) to spray it on their crops. The (10) results were good. Damage to crops (11) down, and profits went up. However, the chemical had effects which the scientists didn’t see in (12) . First, it also killed insects which were the (13) enemies of the harmful insects and which were therefore beneficial to farmers. Second, and perhaps worse, DDT did not kill (14) harmful insect. A few insects had natural resistance to the chemical. They (15) and reproduced in large numbers. In a few years there were large numbers of insects which were not (16) by DDT, and there were (17) insects which Could act as natural (18) on these new "super-insects". Finally, it became clear that DDT was not solving the insect problem. In fact, it was making the problem worse. It (19) became necessary to find a second (20) for the effects of the first.

第（16）空应选择（）

A:effected B:affected C:damaged D:killed