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
Since her husband lost his job, the hopes of their buying a house have ______ even further.
A．expired
B．receded
C．elapsed
D．terminated
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
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