单项选择题

The principal duty of the United Nations is to safeguard the pace of the world.()

A. primary
B. prime
C. privileged
D. precedent

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单项选择题

Every modern government, liberal or otherwise, has a specific position in the field of ideas ; its stability is vulnerable to critics in proportion to their ability and persuasiveness.()

A. futile
B. susceptible
C. feasible
D. flexible

单项选择题

The guest turned upside down his glass as a signal that he would drink no more.()

A. conversed
B. inversed
C. traversed
D. reversed

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