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
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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
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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