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 c-初中英语-魔方格

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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

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