单项选择题

The colour of the sky at the horizon depends on ______.

A．the amount of light
B．the condition of the atmosphere
C．the time of the day
D．the thickness of air
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单项选择题
The passage mainly deals with the topic of ______.
A．protection of environment
B．relationship between neighbors
C．generation gap
D．cause of jealousy
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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