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
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单项选择题
To people's astonishment, the effort to bring the quarreling couple together again ______.
A．came off
B．came on
C．came round
D．came down
单项选择题
Recent studies show that advertising usually ______ competition and therefore lower prices.
A．nourishes
B．flatters
C．fosters
D．facilitates
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