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
Rockets with men in them have reached ______.
A．the sun
B．the moon
C．all the stars
D．some planets
单项选择题
Before stamps were used, postage ______.
A．was paid by the letter-writers
B．was paid by the letter-receivers
C．was got by postmen
D．both B and C
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