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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单项选择题
According to the first paragraph, we can say that _______.
A．the weather always remains the same in a day
B．a fine day can't last for long
C．we rarely think about the weather
D．the weather changes a lot
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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