完型填空20

Owen刘

完型填空20

　　We know that trees are useful in our everyday life. They 　1　 us many things，such as wood，oxygen，rubber，medicines and many other things. They can 　2　 tell us a lot about our climate(气候). The following are the reasons(理由).

　　If you 　3　 a tree，you can see that it has many rings(年轮). Most trees grow one new ring 　4　 year. Because of this reason，we know 　5　 a tree is. A tree over a hundred years old means that it has more than a hundred 　6　 When the climate is dry or very cold，the trees do not grow very much and their rings are usually 　7　. When it is wet and warm，the rings are much thicker. If the rings are suddenly very thin or suddenly very thick，this means that the

　8　 changed suddenly. If we look at the rings on this tree，we can learn about the 　9　 for a hundred years. We can see 　10　 our climate is changing today.

　　1.  A. tell　　  B. ask　　 C. give　　 D. get

　　2.  A. not　　 B. too　　 C. to　　 D. also

　　3.  A. cut across 　 B. climb up 　 C. walk past　 D. look at

　　4.  A. every　　 B. many　　 C. the first　 D. from

　　5.  A. how big　 B. how long　 C. how old　 D. how much

　　6.  A. trees　　 B. leaves　　 C. people　　 D. rings

　　7.  A. big　　 B. thick　　 C. small　　 D. thin

　　8.  A. climate　　 B. trees　　 C. rings　　 D. animal

　　9.  A. people　　  B. things　　 C. climate　  D. life

　　10.  A. how　　  B. why　　 C. when　　 D. while

参考答案

　　1. C　 树能为我们“提供”各种东西。

　　2. D　 除了提供给人类各种物质，还能提供很多气象信息。

　　3. A 　cut across的意思是“砍过”，“破开口子”，而cut up是“砍碎”的意思。

　　4. A

　　5. C　 通过树年轮圈数，可知树的年龄。

　　6. D 　ring的意思是圈，这里指年轮。

　　7. D　 哪年干燥寒冷，那么该年的年轮就薄，也说明这年树长得不快。

　　8. A　 年轮厚、薄变化，说明气候也突然发生过变化。

　　9. C　 通过树的年轮了解气候。

　　10. A　通过对过去气候的研究，可以知道今天的气候是怎样变化的。