单项选择题
36（）
A．submits
B．presents
C．offers
D．issues
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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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单项选择题
The importance of studying clouds is to ______.
A．learn about the change of weather
B．group them and give them names
C．tell the differences in clouds
D．find the likeness of clouds
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