We know that trees are useful in our everyday life. They
1 us many things, such as wood, oxygen(氧气), rubber, medicines and many other things. They can
2 tell us a lot about our climate. The following are the reasons. If you cut across a tree, you can
3 that it has many rings. Most trees grow one
4 ring every 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(干燥的) or very cold, the trees do not grow very much and their rings are usually
7 . When it is wet and
8 , the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the
9 changed suddenly. If we look at the rings on the trees, we can
10 about the climate for a hundred years. We can see how our climate is changing today.
| 小题2: | | A．too | B．as well | C．either | D．also |
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| 小题4: | | A．new | B．old | C．young | D．short |
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| 小题5: | | A．how tall | B．how old | C．how long | D．how far |
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| 小题6: | | A．leaves | B．apples | C．rings | D．trees |
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| 小题7: | | A．big | B．thin | C．thick(厚的) | D．long |
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| 小题8: | | A．cold | B．cool | C．hot | D．warm |
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| 小题9: | | A．climate | B．things | C．people | D．life |
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| 小题10: | | A．think | B．talk | C．learn | D．change |
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