单项选择题

Because of Delaware’s lenient laws regarding business incorporation, many companies have their headquarters in the state’s largest city, Wilmington.

A．production plants
B．home offices
C．sales representatives
D．chemical laboratories
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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
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
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