单项选择题

Because of harsh weather conditions, more than a dozen states in the United States were declared disaster areas in 1977.

A．severe
B．bizarre
C．moist
D．improbable
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单项选择题
To cool itself, a rhinoceros soaks in mud or water because its thick hide has no sweat glands.
A．skin
B．tongue
C．horn
D．trunk
单项选择题
In the eighteenth century the heading of “natural philosophy” encompassed all of the sciences.
A．category
B．teachings
C．ideology
D．leaders
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