3. D。推断题。由最后两段对比可知，人字形线比直线、平等线对控制车速有更长久的影响。
4. A。细节题。 根据paint chevrons and other patterns of stripes on selected roads around the country，可知他们在精心挑选的几条路上试验日本的模式。
5. C。推断题。根据 However, traffic often returns to full speed within months as drivers become used to seeing the painted bars 可知。
(13)
The common cold is the world's most widespread illness, which is plagues(疫病) that flesh receives.
The most widespread mistake of all is that colds are caused by cold. They are not. They are caused by viruses(病毒) passing on from person to person. You catch a cold by coming into contact, directly or indirectly, with someone who already has one. If cold causes colds, it would be reasonable to expect the Eskimos to suffer from them forever. But they do not. And in isolated Arctic regions explorers have reported being free from colds until coming into contact again with infected people from the outside world by way of packages and mail dropped from airplanes.
During the First World War soldiers who spent long periods in the trenches(战壕), cold and wet, showed no increased tendency to catch colds.
In the Second World War prisoners at the notorious Auschwitz concentration camp(奥斯维辛集中营), naked and starving, were astonished to find that they seldom had colds.
At the Common Cold Research Unit in England, volunteers took part in Experiments in which they gave themselves to the discomforts of being cold and wet for long stretches of time. After taking hot baths, they put on bathing suits, allowed themselves to be with cold water, and then stood about dripping wet in drafty room. Some wore wet socks all day while others exercised in the rain until close to exhaustion. Not one of the volunteers came down with a cold unless a cold virus was actually dropped in his nose.
If, then, cold and wet have nothing to do with catching colds, why are they more frequent in the winter? Despite the most pains—taking research, no one has yet found the answer. One explanation offered by scientists is that people tend to stay together indoors more in cold weather than at other times, and this makes it easier for cold viruses to be passed on.
No one has yet found a cure for the cold. There are drugs and pain suppressors(止痛片) such as aspirin, but all they do is to relieve the symptoms(症状).
1. The writer offered _______ examples to support his argument.
A. 4B. 5C. 6D. 3
2. Which of the following does not agree with the chosen passage?
A. The Eskimos do not suffer from colds all the time.
B. Colds are not caused by cold.
C. People suffer from colds just because they like to stay indoors.
D. A person may catch a cold by touching someone who already had one.
3. Arctic explorers may catch colds when ________.
A. they are working in the isolated Arctic regions
B. they are writing reports in terribly cold weather
C. they are free from work in the isolated Arctic regions
D. they are coming into touch again with the outside world
4. The passage mainly discusses ________.
A. the experiments on the common cold
B. the fallacy about the common cold
C. the reason and the way people catch colds
D. the continued spread of common colds
【答案解析】
本文为议论文。阐述了“感冒不是由寒冷引起的”观点。
1. B。细节题。作者举了5个例子来说明自己的观点：Eskimos; explorers in isolated Arctic regions; soldiers during the First World War; prisoners at the Auschwitz concentration camp; volunteers in Experiments.
2. C。细节题。选项A、B、D均与原文相符(见第二段)，而选项C显然与文中的You catch a cold by coming into contact, directly or indirectly, with someone who already has one. 不相符，故选C。
3. D。细节题 从 …explorers have reported being free from colds until coming into contact again with infected people from the outside中可以知道，这些探险者是因为与外界接触而感冒的。
4. B。主旨题。第二段的第一、二句The most widespread mistake of all is that colds are caused by cold. They are not.是本文的主题句。全文主要阐述了“感冒不是由寒冷引起的”这一观点。
(14)
Zinc(锌) is one of about 20 elements necessary for good health. It is present in the body in a very small amount but makes it possible for important chemical actions to be carried out in cells. Scientists are just beginning to discover how zinc and other elements work.
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