完形填空。 We know that trees are useful in o

问题完形填空

完形填空。
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. The following are the reasons. 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 Iook at the rings on this tree, we can learn about the __9__ for a hundred years. We can see__10__ 0ur climate is changing today.
( ) 1. A. tell ( ) 2. A. not ( ) 3. A. cut down ( ) 4. A. many ( ) 5. A. how big ( ) 6. A. trees ( ) 7. A. big ( ) 8. A. climate ( ) 9. A. people ( ) 10. A. how	B. ask B. too B. climb up B. every B. how long B. leaves B. thin B. trees B. things B. why	C. give C. also/ C. walk past C. the first C. how old C. rings C. small C. things C. climate C. when

答案

1. C 2. C 3. A 4. B 5. C 6. C 7. B 8. A 9. C 10. A