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

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.

单项选择题

The project to build five new schools in this region _______ by the end of the next year.

A．will have been completed
B．will have completed
C．is being completed
D．has been completed