It is eight o'clock on a Monday morning, and it is ___1_____ A cold wind is ___2_____ and the sky（天空） is grey（灰色的）. Men and women are going ___3_____ work. Some are walking. Some are riding on bikes. Some are waiting for buses on windy corners（角落）in the rain. ____4____ are driving their cars, or riding ____5____ the cars of their neighbours（邻居）and friends. The city streets are ____6____ of cars and buses. All are moving slowly, one after another（一个接一个）, ___7_____ the city streets and on the roads between cities and towns.

　　Children are going to ___8_____ . Some are riding on school buses. Some are riding in ____9____ parents cars. Many are walking, and they are ____10____ very happy. Life is not beautiful on a rainy Monday morning.

（　）1. A. fine　　　　   B. sunny　　　　　　　　　　  C. raining　　　　　　　　　　 D. snowing

（　）2. A. going　　　　 B. blowing　　　　　　　　    C. welcome　　　　　　　　  D. reading

（　）3. A. to　　　　　　  B. at　　　　　　　　　　　　    C. in　　　　　　　　　　　　    D. before

（　）4. A. Another　　  B. Other　　　　　　　　　　   C. Others　　　　　　　　　　 D. Rest

（　）5. A. in　　　　　　  B. by　　　　　　　　　　　　   C. to　　　　　　　　　　　　    D. with

（　）6. A. little　　　　   B. few　　　　　　　　　　　　 C. empty　　　　　　　　　　  D. full

（　）7. A. to　　　　　　  B. along　　　　　　　　　　   C. up　　　　　　　　　　　　   D. out

（　）8. A. play　　　　   B. work　　　　　　　　　　   C. town　　　　　　　　　　   D. school

（　）9. A. the　　　　    B. their　　　　　　　　　　　　 C. our　　　　　　　　　　　　  D. his

（　）10. A. all　　　　    B. always　　　　　　　　　　 C. never　　　　　　　　　　   D. not

　　You see,in a plant's stem（茎）there are several hundred “water pipes （管道）”that bring water from soil all the way up to the leaves. When the ground turns dry, it becomes harder and harder for plants to do this.

　　In very hot days, plants have to get any water that it can. Scientist Robert Winter has found out that when plants can get no water, their “water pipes” snap （发出断裂声）. When that happens, the whole plant vibrates （振动） a little.

　　Robert knows that healthy, well-watered plants are quiet. He also knows that many insects （昆虫）prefer attacking dry plants rather than healthy plants. How do the insects know which are healthy plants and which are not? Robert thinks that the insects may hear the plants crying and then they may come to kill it.

(1)There are many “water pipes”_________.

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(2)When plants can, ________, their “water pipes” snap.

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(3)When “water pipes”snap, the whole plant ________.

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