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. It 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_ or 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

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