单项选择题

This passage could be entitled ______.

A．Rockets
B．Principles of Rocket
C．Cylinder
D．The Rocket Belt
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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
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
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