单项选择题

Cosmetics, rarely noted today for any dangerous properties, have been （）for serious health problems in the past.

A. responsibility
B. responsible
C. its responsibility
D. the responsible

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单项选择题
It is a common theme in many science fiction stories that the world may one day be （） by insects.

A. broken in
B. taken over
C. run over
D. filled in
单项选择题
Our research has focused on a drug which is so （） as to be able to change brain chemistry.

A. powerful
B. influential
C. monstrous
D. vigorous
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