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
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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
单项选择题
To alleviate the problem of contaminated chicken, the study panel recommends that the federal government shift its inspection emphasis from cursory bird-by-bird visual checks to a more ______ random sampling for bacterial and chemical contamination.
(A) rigorous
(B) perfunctory
(C) symbolic
(D) discreet
(E) dubious
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