完形填空。 We know that tree

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完形填空。

       We know that trees are useful in our everyday life. They     1    us many things, such as wood, rubber,
medicine and many other things. They can     2     tell us a lot about our climate (气候). If you     3    a tree,
you can see that it has many rings (年轮). Most trees get a 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 (突然地) very thin or very thick, this
means that the     8     changed suddenly. If we look at the rings on this tree, we can learn     9    the climate
for a hundred years. And we can see    10    our climate is changing today.

1-5: C D A B C 6-10: D B A A C

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