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
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
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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