题目内容

Why might some parents want to know the gender of their child before it is _______?

A. borning
B. born
C. burn
D. burning

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The use of genetic engineering should be restricted______just those cases.

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

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