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
A．fallsB．removesC．resultsD．comes
A．falls
B．removes
C．results
D．comes
单项选择题
Jackson changed his job because he_______.
A．hurt himself during his work.
B．was not satisfied with his pay.
C．wanted to work harder.
D．found the job too hard.
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