题目内容

9. 紧挨着      

10. 在花瓶后      

11. 在篮子下面      

12. 在两本书之间      

9. next to   10. behind a vase   11. under a basket   12. between two books  

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    We all cry for water when we are thirsty. But do you know,in very hot,dry weather,plants also make very low sounds as if they are crying for help?

    You see,in a plants stem there are several hundred “water pipes”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 they can get.

    Scientists Robot Winter has found out that when plants can get no water,their “ water pipes ” snap (发出声音) . When that happens,the whole plant vibrates (颜动) a little.

    Robot knows that healthy,wellwatered plants are quiet. He also knows that dry plants are many insects’ favorites and they often attack (袭击) them. How do the insects know which are healthy plants and which are not? Robot thinks that the insects may hear the plants “crying” and they may come to kill them.

26. There are many “water pipes”       .

   A. in a plant’s stem   B. in a plant’s root

   C. in the sunshine   D. in the soil

27. It       for plants to get water when the ground turns dry.

   A. is easy   B. is difficult

   C. takes little time   D. is not necessary

28. When plants can      ,their “water pipes” snap.

   A. grow well   B. get no sunlight

   C. have enough water   D. get no water

29. When“water pipes”snap,the whole plant       .

   A. keeps quiet   B. gets well

   C. vibrates a little   D. makes very loud sounds

30. Many insects like to attack      .

   A. quiet plants   B. dry plants

   C. healthy plants   D. wellwatered plants


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