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  3. At one time or another we have all stopped to think about the weather. Some days the weather is good. Some days the weather is b

At one time or another we have all stopped to think about the weather. Some days the weather is good. Some days the weather is b

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问题     At one time or another we have all stopped to think about the weather. Some days the weather is good. Some days the weather is bad. Still, there are days when the weather seems to change from hour to hour. A day that starts out fine might not stay that way. Sometimes a day that seems bad turns out better than you thought it would. There are ways of understanding the weather. One way is to study the clouds.
    No two clouds are ever alike. But it is still possible to group clouds and to give them names. We can recognize the different kinds of clouds and watch them for signs of changing weather.
    As a rule, the higher the clouds, the better the weather. And the lower the clouds, the worse the weather is likely to be. To predict the weather, there are three things about clouds you should look for: movement, color, and change.
    Clouds can tell you if storm is on the way. For example, small feathery cirrus clouds (卷云) can become thick and move lower. This means rain is on the way. If there is a sudden, cool breeze (微风) thunder (雷声) clouds appears, then a storm is about to break out.
This passage is mainly about ______.
选项 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
答案A
解析 本题为主旨题。通读全文，不难看出文章第一段就引出云与天气有关，接下来的三段都在谈它们之间的具体关系。因此应选A。
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