单项选择题

In the US, psychologists at a number of universities are making a serious study of how rumors are born, how they ______ and how they can finally be killed off.

A．congregate
B．segregate
C．aggregate
D．propagate
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单项选择题
The figures show evidence that murders in the nation's capital are beginning to ______ .
A．waste away
B．pass out
C．level off
D．tie down
单项选择题
Profitable for 35 ______ years, Secom has a 60% share of the domestic market and is also. expanding abroad.
A．consecutive
B．periodic
C．chronological
D．consequent
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