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.
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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
Which of the following statements is TRUE
A．If clouds are high, there will be bad weather.
B．The color of clouds is a factor to help predict the weather.
C．If the weather is good, the clouds must be very low.
D．To study clouds is the only way to understand the weather.
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