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
What does the head of the IEA suggest as the reason for the increase of emission in China
A．Because of the rapid development of private cars in big cities.
B．Because of the further promotion of China’s open-up policy.
C．Because of governmental policy of refusing to limit gases.
D．Because of the rising consumption of gases in domestic heavy industries.
单项选择题
As a way of ______ the mails while they were away, the Johnsons asked the cleaning lady to send little printed slips asking the senders to write again later.
A. picking up
B. coping with
C. passing out
D. getting across
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