单项选择题

Diffusion of light in the sky occurs owing to ______.

A．atmospheric impurities
B．molecules of gas
C．varied shades of colour
D．different times of the day
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单项选择题
What did Terry not approve of
A．Letting outside of the houses in Jenkins Street.
B．The height of the houses in Jenkins Street.
C．The way Leslie managed to look over the wall.
D．His father's concern for other people's feelings.
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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