单项选择题

Libby lied to investigators about his role in disclosing the identity ofa CIA officer in order to () the White House from political embarrassment.

A. aviate
B. recover
C. berate
D. insulate

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单项选择题

It wasn’t until the late 19th century that physicians realized that its () symptoms were all part of the same disease.

A. perfunctory
B. peremptory
C. perplexing
D. perambulatory

单项选择题

CNBC, the cable business network, and the New York Times have joined forces to create an alliance against a common(): Rupert Murdoch’s News Corp.

A. void
B. foe
C. cockpit
D. gist

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