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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单项选择题
Regular visits from a social worker can be of immense value to old people living alone.
A. equal
B. immediate
C. moderate
D. great
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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