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
It is due to the invention of the computer that man has been able to work so many wonders in the past few years. A case ______is the successful launching of space shuttle.
A. in point
B. in question
C. in a way
D. in brief
单项选择题
A
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