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
In the writer's real opinion, Kanai
A．is not worth visiting at all
B．is well worth visiting
C．is not a beautiful island
D．is a dangerous island
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