单项选择题

During a civil defense exercise, the police ______ the streets in ease anyone tried to leave shelter too soon.

A．paved
B．patrolled
C．peered
D．permeate
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单项选择题
The old building is in a good state of ______ except for the wooden floors.
A．observation
B．preservation
C．conservation
D．compensation
单项选择题
Young people's social environment has a ______ effect on their academic progress.
A．gross
B．solid
C．profound
D．complete
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