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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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
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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