单项选择题

Our new teacher is much younger than his ______.

A．successor
B．predecessor
C．colleague
D．workmate
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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
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
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