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
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
According to the passage, sudden deaths are probably caused by ______.
A．mental stress
B．physical diseases
C．unexpected accidents
D．poisons
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