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
He was weary of the constant battle between them.
A. fond
B. proud
C. tired
D. afraid
单项选择题
Sleep stairs can present a particular hazard to older people.
A. picture
B. danger
C. evidence
D. case
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