单项选择题

Smoking not only ______ the throat but can also cause cancer, loss of appetite and irregular heart beat.

A．irritates
B．induces
C．intimidates
D．invades
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单项选择题
Another way to judge whether your home has or could develop indoor air problems is to potential sources of indoor air pollution.
A．signify
B．identify
C．claim
D．recognize
单项选择题
The author's primary concern is to ______.
A．refute a theory
B．draw a distinction
C．condemn an error
D．describe a new development
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