完形填空。 We know that trees are uful in our everyday life.They

题文

完形填空。     We know that trees are uful 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 e that it has many rings (年轮).  Most trees grow one  new ring __4__ year. Becau 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  e__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        

题型：未知 难度：其他题型

答案

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

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