单项选择题

The author has written the passage mainly for ______.

A．young adventurers
B．the common readers
C．professional pilots
D．researchers interested in the rocket
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单项选择题
The purpose of the author in discussing a rocket engine and a steel cylinder is ______.
A．to tell the readers how knowledgeable he is
B．to help the readers well understand how the rocket belt works
C．to prove that it is very fun to drive a rocket belt'
D．to inspire people's imagination
单项选择题
In the forthcoming paragraph, the author is most probably going to talk about ______.
A．other rockets
B．how to drive a rocket belt
C．special fuels used in rockets
D．functions of the rocket belt
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