单项选择题

During the First World War, soldiers who spent long periods in cold and wet trenches ______.

A．often caught colds
B．never caught colds
C．did not show increased tendency to catch colds
D．did not increase in number
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单项选择题
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 contact again with the outside world
单项选择题
According to the passage, there are more myths about the common cold than any other human disease because ______.
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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