单项选择题

______ is the center of our planetary system was a difficult concept to grasp in the Middle Age.

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
Student demonstrators demanded ______.
A．the president’s resignation
B．early elections
C．free elections
D．severe punishment for corrupted officials
单项选择题
According to the conversation, what is the advice for young people
A．To keep a healthy diet.
B．To join some social clubs or groups.
C．To do regular checkups.
D．To stay optimistic about lif
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