单项选择题

The topic of your investigation must be one _______.

A．from which you can form your report
B．that you are interested in
C．that your teacher approves
D．that you already have in your mind
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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
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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