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
E-mail is a convenient, highly democratic informal medium for conveying messages that ______ well to human needs.
A．adheres
B．reflects
C．conforms
D．satisfies
单项选择题
The elderly Russians find it hard to live on their state ______.
A．pensions
B．earnings
C．salaries
D．donations
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