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
Which of the following is NOT true
A．The Eskimos seldom suffer from colds.
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 has one.
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
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