单项选择题

A rocked is pushed up into the air when ______.

A．hot gas rushes out its head
B．it is powered by gas
C．hot gas rushes out of its bottom
D．hot gas rushes out of its neck
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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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