单项选择题

Another hazard was that bottles sometimes fell off the shelves because of ______ from above.

A．vocation
B．vibration
C．ventilation
D．violation
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单项选择题
Analytical and quantitative abilities, problem-solving ______ and skill in the use of statistical methods and computers are all developed by studying economics--these place graduates at a considerable advantage on the job market.
A．aptitude
B．amplitude
C．altitude
D．multitude
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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