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

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单项选择题
Scientists knew()about the moon a long time ago.

A．nothing
B．many things
C．everything
D．little
单项选择题
Rockets with men in them have reached()

A．the sun
B．the moon
C．all the stars
D．some planets
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