单项选择题

What is a rocket made of

A．It is made of rubber.
B．It is made of metal.
C．It is made of air.
D．It is made of balloon.
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单项选择题
Rocket can fly to the moon because ______.
A．it looks like a balloon
B．it is lighter than an airplane
C．it doesn"t have wings
D．it works like an untied balloon
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