单项选择题

The sky has a darker blue colour when we look at it ______.

A．near a mountain
B．against a mountain
C．from the top of a mountain
D．at the foot of a mountain
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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
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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