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A．For a week.
B．For two weeks.
C．For three weeks.
D．For a month.
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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
单项选择题
A．Our brain contract as we grow old.B．One part of the brain does not contract.C．Sixty-year olds have better brains than thirty-year olds.D．Some people’’s brains have contracted earlier than other people’’s.
A．Our brain contract as we grow old.
B．One part of the brain does not contract.
C．Sixty-year olds have better brains than thirty-year olds.
D．Some people’’s brains have contracted earlier than other people’’s.
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