单项选择题

"Cold-blooded" means that the core temperature remains close to the ______ temperature "as it rises and falls."

A．amicable
B．amiable
C．ambient
D．ambitious
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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
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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