单项选择题

This door was always kept closed so that the strong odors of tobacco, cigarettes, cigars, and leather goods should not ______ into the sweet shop.

A．penetrate
B．diffuse
C．permeate
D．saturate
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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
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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