At one time or another we have all stopped to think about 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（微風）and a dark thunder(雷聲) clouds appears, then a storm is about to break out.

1.According to the first paragraph, we can say that_______.

A. the weather always remains the same in a day

B. a fine day can't last for long

C. we rarely think about the weather

D. the weather changes a lot

2.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

3.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.

4.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.

5.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 sign of the rain and storm

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