单项选择题

The grounds of the presidential palace are ______ by soldiers with guard dogs 24 hours a day.

A．surveyed
B．patrolled
C．investigated
D．inspected
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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
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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