完形填空，从每小题A、B、C、D四个选项中，选择能填入相应空白处的最佳*。Weknowthattreesar...

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完形填空，从每小题A、B、C、D四个选项中，选择能填入相应空白处的最佳*。

We know that trees are useful in our everyday life. They 1 us many things, such as wood, oxygen(氧气), rubber(橡胶), medicines and many other things. They can 2 tell us a lot about our climate. The following are the reasons(原因). 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 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(突然). If we look at the rings of this tree, we can 9 about the climate 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 down B. climb up C. walk past D. look at

( )4. A. many B. every C. some D. only

( ) 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. thin C. things D. small

( ) 8. A. climate B. trees C. sky D. animal

( ) 9. A. study B. get C. learn D. teach

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

【回答】

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