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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热门试题

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

单项选择题Which of the following is the sign of a storm

A．A sudden and warn wind.
B．Thick and lower clouds.
C．Small and feathery cirrus clouds.
D．Dark and thunder clouds.