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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单项选择题
ff you don't agree with me, feel free to ______ your own proposals.
A．put forward
B．put out
C．put on
D．put in
单项选择题
The higher the standard of living and the greater the national wealth, ______.
A．the greater amount of paper is used
B．the greater is the amount of paper is used
C．the greater the amount of paper used
D．the amount of paper used is greater
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