单项选择题

According to the passage, how many sudden deaths are reported all over the world

A．400,000
B．600,000
C．800,000
D．none of the above
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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
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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