单项选择题

Fortified medieval towns were often surrounded by two water moats.

A．protected
B．encircled
C．flooded
D．supplied
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单项选择题
Louis Sullivan, a famous American architect, varied his structures to suit the local climate.
A．modify
B．enhance
C．accommodate
D．avoid
单项选择题
The windchill factor, the combination of low temperature and wind speed, strikingly increases the degree of cold felt by a person who is outdoors.
A．effectively
B．remarkably
C．certainly
D．unquestionably
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