单项选择题

Studies have shown that smoking is a factor for gastric cancer either by itself, or more ______ when in combination with another factor such as coal dust exposure or the consumption of alcohol.

A．tentatively
B．potently
C．relentlessly
D．jointly
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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
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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