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【单选题】
(三)
(三)The passage mainly discusses（）.
A．a new way of highway speed control
B．a new pattern for painting highways
C．a new way of training drivers
D．a new type of optical illusion
B．a new pattern for painting highways
C．a new way of training drivers
D．a new type of optical illusion
A.
Believe it or not, optical illusion can cut highway crashes.
B.
Japan is a case in point. It has reduced automobile crashes on some roads by nearly 75 percent using a optical illusion. But stripes, called chevrons, painted on the roads make drivers think that they are driving faster than: they really are, and thus drivers slow down.
C.
Now the American Automobile Association Foundation for Traffic Safety in Washington D. C. is planning to repeat Japan’s success. Starting next year, the foundation will paint chevrons and other patterns of stripes on selected roads around the country to test how well the patterns reduce highway crashes.
D.
Excessive(too great) speed plays a major role in as much as one fifth of all fatal traffic accidents, according to the foundation. To help reduce those accidents, the foundation will conduct its tests in areas where speed-related hazards(er) are the greatest curves, exit slopes, traffic circles, and bridges.
E.
Some studies suggest that straight, horizontal bars painted across roads can initially cut the average speed of drivers in half. However, traffic often returns to full speed within months as drivers become used to seeing the painted bars.
F.
Chevrons, scientists say, not only give drivers the impression that they are driving faster than they really are but also make a lane appear to be narrower. The result is a longer lasting reduction in highway speed and the number of traffic accidents.
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【单选题】阅读下面的科技文，回答第7～10题。 几个月前，来自一些地方的研究人员演示了使光以每秒17米的缓慢速度通过一堆冰冷的钠原子的过程。但是把原子冷却到接近绝对零度是非常困难的，要使以慢光为基础的应用能够变为现实，需要采用简单一些的方法。 德克萨斯州农业机械大学的韦尔奇博士意识到，在冰冷的钠原子中使光速降低的基本原理在热的铷原子中也同样适用。用热的铷原子做实验要简单得多，它包括把一个装有固体铷金属的特殊...
A.
温度接近于绝对零度的钠原子可以把光速降低为17米/秒。
B.
在高温中的铷原子处在一种非常微妙的量子状态中。
C.
利用热的铷原子传送光脉冲可以比利用光缆更加有效。
D.
缓慢通过高温铷气的入射光具有非线性效应。
【单选题】第（8）空应选择（） A．asked B．requested C．declared D．encouraged
A.
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.
【单选题】据对一批企业的调查显示，这些企业总经理的平均年龄是57岁，而在20年前，同样的这样企业的总经理的平均年龄大约是49岁。这说明，目前企业中总经理的年龄呈老龄化趋势。 以下哪一项，对题干的论证提出的质疑最为有力( )
A.
题干中没有说明，20年前这些企业关于经理人选是否有年龄限制
B.
题干中没有说明，这些总经理任职的平均年数
C.
20年前这些企业的总经理的平均年龄，仅是个近似数
D.
题干中的信息，仅仅基于有20年以上历史的企业
【单选题】第（3）空应选择（） A．cause B．harm C．break D．disturb
A.
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.
B.
相关题目：
【单选题】阅读下面的科技文，回答第7～10题。 几个月前，来自一些地方的研究人员演示了使光以每秒17米的缓慢速度通过一堆冰冷的钠原子的过程。但是把原子冷却到接近绝对零度是非常困难的，要使以慢光为基础的应用能够变为现实，需要采用简单一些的方法。 德克萨斯州农业机械大学的韦尔奇博士意识到，在冰冷的钠原子中使光速降低的基本原理在热的铷原子中也同样适用。用热的铷原子做实验要简单得多，它包括把一个装有固体铷金属的特殊...
A.
温度接近于绝对零度的钠原子可以把光速降低为17米/秒。
B.
在高温中的铷原子处在一种非常微妙的量子状态中。
C.
利用热的铷原子传送光脉冲可以比利用光缆更加有效。
D.
缓慢通过高温铷气的入射光具有非线性效应。
【单选题】第（8）空应选择（） A．asked B．requested C．declared D．encouraged
A.
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.
【单选题】据对一批企业的调查显示，这些企业总经理的平均年龄是57岁，而在20年前，同样的这样企业的总经理的平均年龄大约是49岁。这说明，目前企业中总经理的年龄呈老龄化趋势。 以下哪一项，对题干的论证提出的质疑最为有力( )
A.
题干中没有说明，20年前这些企业关于经理人选是否有年龄限制
B.
题干中没有说明，这些总经理任职的平均年数
C.
20年前这些企业的总经理的平均年龄，仅是个近似数
D.
题干中的信息，仅仅基于有20年以上历史的企业
【单选题】第（3）空应选择（） A．cause B．harm C．break D．disturb
A.
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.
B.
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