单项选择题

Volunteers taking part in the experiments in the Common Cold Research Unit ______.

A．suffered a lot
B．never caught colds
C．often caught colds
D．became very strong
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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 touch again with the outside world
单项选择题
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
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