单项选择题

Some species of bacteria and fungi thrive on simple compounds such as alcohol.

A．mix with
B．do well on
C．exist in
D．float on
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单项选择题
The megaphone makes the voice sound louder because it points sound waves in one direction and keeps them from spreading out in all directions.
A．slithering
B．radiating
C．interfering
D．murmuring
单项选择题
Prohibition in the United States ushered in an era of crime and corruption.
A．introduced
B．caused
C．used
D．upset
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