单项选择题

Environmental officials insist that something be done to______acid rain.

A．curb
B．sue
C．detoxify
D．condemn
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单项选择题
The best exercise should require continuous______, rather than frequent stops and starts.
A．compassion
B．acceleration
C．frustration
D．exertion
单项选择题
We now obtain more than two-thirds of our protein from animal sources, while our grandparents ______only one-half from animal sources.
A．originated
B．digested
C．deprived
D．derived
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