单项选择题

The word "legitimate" in Paragraph 1 can best be replaced by ______.

A．lawful
B．reasonable
C．regular
D．complex
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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
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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