单项选择题

The primary reason why the Constitution requires a census every ten years is to provide a basis for the apportionment (分配，分摊) of representative among the states.

A．offend
B．present
C．consume
D．supply
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单项选择题
The tree fell on the roof of a car and crushed it.
A．exploded
B．smashed
C．fetched
D．touched
单项选择题
Once upon a time they used to mine coals in these valleys.
A．At a time
B．At one time
C．At times
D．At the time
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