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
We can infer from tile passage that ______.
A．voodoo prevails more in Africa than in other pans of the world
B．the sudden deaths of animals differ in causes from those of people
C．the connection between sympathetic nervous system and irregular heart rhythms is clear
D．In modern society, sudden deaths take place much less because of higher medical levels
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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