[单项选择] The common cold is the world’’s most widespread illness, which is probably why there are more myths about it than any of the other plagues that flesh is heir to. The most widespread fallacy of all is that colds are caused by cold. They are not. They are caused by viruses passed on from person to person. You catch a cold by corning 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 permanently. 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, 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 astonished
A. it spreads more quickly
B. it is the most widespread illness
C. the climate of the world is getting colder and colder
D. few people can catch colds

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