单项选择题

If the fire alarm is sounded, all residents are requested to ______ in the courtyard.

A．assemble
B．converge
C．crowd
D．accumulate
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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
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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