完形填空。 We know that trees are useful

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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, 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 see that it has many rings. Most trees grow one new ring __ 4 __ year. Because of the 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 look at the rings on this tree, we can learn about the __ 9 __ for a hundred years. We can see __ 10 __ our climate is changing today.
( ) 1．A．tell ( ) 2．A．not ( ) 3．A．cut across ( ) 4．A．every ( ) 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．many B．how long B．leaves B．thick B．trees B．things B．why	C．give C．to C．walk past C．the first C．how old C．people C．small C．rings C．climate C．when	D．get D．also D．look at D．from D．how much D．rings D．thin D．animals D．life D．while

1—5: CDAAC 6—10: DDACA

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