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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单项选择题
Exhaled cigarette smoke is yellowish because ______.
A．it comes through the mouth
B．it contains nicotine
C．of water vapour in the mouth
D．it is a good diffuse of light
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