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 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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