单项选择题

Flu shots are given every fall as a precaution against an epidemic the following winter.

A．required treatment
B．free service
C．preventive measures
D．new therapy
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单项选择题
Mark Twain is one of the best American creative writers.
A．productive
B．inventive
C．fanciful
D．ingenious
单项选择题
The rapid expansion of cities during the Industrial Revolution created a housing crisis.
A．avoided
B．brought about
C．aggravation
D．started with
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