单项选择题

Normally an individual thunderstorm lasts about 45 minutes, but under certain conditions the storm may ______, becoming ever more severe, for as long as four hours.

(A) wane
(B) moderate
(C) persist
(D) vacillate
(E) disperse

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单项选择题

In one shocking instance of ______ research, one of the nation’ s most influential researchers in the field of genetics reported on experiments that were never carried out and published deliberately ______ scientific papers on his nonexistent work.

(A) comprehensive...abstract
(B) theoretical...challenging
(C) frandulent...deceptive
(D) derivative...authoritative
(E) erroneous...impartial

单项选择题

Some Central Intelligence Agency officers have ______ their previous statements denying any involvement on their part with the Contra aid network and are now revising their earlier testimony.

(A) justified
(B) recanted
(C) repeated
(D) protracted
(E) heeded

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