单项选择题

In the country we are excluded from the worries of life in a big town.()

A. enveloped
B. protected
C. insulated
D. subtracted

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单项选择题
A considerable amount of time and money has been invested in () this system.

A.defining
B.implying
C.reducing
D.perfecting
单项选择题
His inability to learn foreign languages was a(n) obstacle to his career.()

A. barrier
B. excess
C. carrier
D. impulse
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