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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（） evidence that language-acquiring ability must be stimulated.

A. It being
B. It is
C. There is
D. There being
单项选择题
They usually have less money at the end of the month than （） at the beginning.

A. which is
B. which was
C. they do
D. it is
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