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
Another hazard was that bottles sometimes fell off the shelves because of ______ from above.
A．vocation
B．vibration
C．ventilation
D．violation
单项选择题
These notes, which are relevant to international students, are intended to supplement information given in the Guide and should be read ______ the appropriate sections on accommodation, applications, entrance requirements, etc.
A．in comparison with
B．in conjunction with
C．in conflict with
D．in contrast with
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