单项选择题

According to some economists' comments, unemployment is a ______ problem which won't just disappear overnight.

A．stubborn
B．revealing
C．ingenious
D．integral
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单项选择题
American people ______ fair competition more than any other values so that they speak highly of business instead of government, which is characterized by monopoly.
A．embody
B．cherish
C．fascinate
D．illuminate
单项选择题
That was an era when many Americans felt it was their ______ duty to support the war.
A．authentic
B．ethnic
C．eccentric
D．patriotic
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