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
Which of the following is the sign of a storm
A．A sudden and warm wind.
B．Thick and lower clouds.
C．Small and feathery cirrus clouds.
D．Dark and thunder clouds.
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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