单项选择题

A．Most of us should take more exercise.
B．It’’s better to live in the town.
C．The brain contracts if it is not used.
D．The more one uses his brain, the sooner he becomes old.
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单项选择题
A．For a week.B．For two weeks.C．For three weeks.D．For a month.
A．For a week.
B．For two weeks.
C．For three weeks.
D．For a month.
单项选择题
When sunlight enters a dark room through the blinds______.
A．particles of dust are suspended
B．tiny dust particles become visible
C．it is very bright
D．it becomes visible
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