单项选择题

By ______computation, he estimated that the repairs on the house would cost him a thousand dollars.

A．coarse
B．rude
C．rough
D．crude

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单项选择题

Could you just give me a hand Let's ______the car into motion; it got a flameout just now.

A．shove
B．nudge
C．prompt
D．poke

单项选择题

______is the center of our planetary system was a difficult concept to grasp in the Middle Ages.

A．It is the sun and not the earth
B．Being the sun and not the earth
C．The sun and not the earth
D．That the sun and not the earth

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