单项选择题

A plane can't fly to the moon because()

A．the moon is 240 kilometer far away
B．we don't know where it is
C．it can't fly without air
D．there is no air on the moon

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单项选择题
The moon is () away from the earth.

A．about 384 000 kilometers
B．240 000 kilometers
C．only 348 000 kilometers
D．about 384 000 meters
单项选择题
Scientists knew()about the moon a long time ago.

A．nothing
B．many things
C．everything
D．little
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