单项选择题

The weight of the moon is only about ______ of that of the earth.

A．one eighty
B．one of eighty
C．one the eightieth
D．one eightieth
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单项选择题
They elected Bush______President of ______ United States of America.
A．a, the
B．a, an
C．/, the
D．the, /
单项选择题
—Is Marsha still here—No. She was the first______.
A．leaving
B．that she left
C．to leave
D．in leaving
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