单项选择题

38（）

A．as
B．when
C．after
D．while

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单项选择题
36（）

A．submits
B．presents
C．offers
D．issues
单项选择题
This passage is mainly about ______.
A．the relation between the weather and clouds
B．the ways of grouping and naming clouds
C．the causes of differences in weather
D．the signs of the rain and storm
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