单项选择题

Your dog needs at least 20 minutes of vigorous exercise every day.

A. energetic
B. free
C. physical
D. regular

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单项选择题

I enjoyed the play--it had a clever plot and very funny dialogues.

A. boring
B. original
C. humorous
D. long

单项选择题

Sleep stairs can present a particular hazard to older people. A. picture B danger C. evidence D. case

Sleep stairs can present a particular hazard to older people.
A. picture B danger C. evidence D. case

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