题目内容

Do you have a ________ of some kind of DNA that you want to clone.

A. fragile
B. fragrant
C. feather
D. fragment

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This city ________ 32 among the 44 places in terms of economic development.

A. ranks
B. ruins
C. revenges
D. reunites

Girls may like science rather than arts and ____________, which should be encouraged.

A. humanities
B. humane
C. humans
D. hostile

Smiling has been proven to __________ the pain and stress.

A. intensify
B. tension
C. relieve
D. relive

The deteriorative environment is likely to ___________ some species.

A. endanger
B. benefit
C. promote
D. facilitate