单项选择题

We have had to raise our prices because of the increase in the cost of materials.

A．primitive
B．rough
C．original
D．raw
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单项选择题
Our new teacher is much younger than his ______.
A．successor
B．predecessor
C．colleague
D．workmate
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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