单项选择题

Clouds are formed from ______.

A．evaporation
B．water vapor
C．outer space
D．the hydrologic cycle
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单项选择题
One of my foreign friends is looking forward to ______ my country.
A．visit
B．visiting
C．having visited
D．be visiting
单项选择题
Experienced drivers have ______ accidents than beginners.
A．least
B．little
C．fewer
D．few
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