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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热门试题

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

单项选择题

The writer offered ______ examples to support his argument.

A．4
B．5
C．6
D．3