题目内容

The use of genetic engineering should be restricted______just those cases.

A. around
B. at
C. on
D. to

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Reportedly, one scientist has even ______of using genetic engineering.

A. speak
B. speaking
C. spoken
D. spoke

It is ______to consider physical traits.

A. time
B. way
C. timing
D. ways

All of this brings___some difficult social and moral questions.

A. to
B. on
C. onto
D. up

Will too many parents choose to have children of the same gender leading to a ____of boys or girls?

A. shorting
B. shortage
C. leak
D. leap