閱讀短文，回答問題。
     The common cold is the world's most widespread illness. The most widespread mistake of all is that
colds are caused by cold weather. 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 weather 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 (探險(xiǎn)者) have reported being free
from colds until coming into contact again with the outside world by way of packages and mails
dropped from airplanes. During the First World War soldiers who spent long periods in the trenches,
cold and wet, showed no increased tendency to catch colds. In the Second World War prisoners
at the notorious Auschwitz concentration camp, naked and starving, were extremely surprised to
find that they seldom had colds.
     At the Common Cold Research Unit in England, volunteers took part in the 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 rooms. 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 (often)
in the winter? Despite the most painstak- ing 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 colds. There are drugs and pain sup- pressors such as aspirin,
but all they do is to relieve the symptoms (癥狀). 
1. Are the common colds caused by cold?
________________________________________________________________.
2. When may Arctic explorers catch colds?
________________________________________________________________.
3. How many kinds of people does the writer mention when explaining his idea?
________________________________________________________________.
4. Why arc the colds more frequent in the winter?
________________________________________________________________.
5. What is the key point of this passage?
________________________________________________________________.
1. No. (No, they aren't.)
2. When coming into touch again with the outside world.
3. Five.
4. Because people like to stay indoors,
    and this makes it easier for cold viruses to be passed on.
5. Colds are not caused by cold weather.
(Colds are caused by viruses, not by cold weather.)
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