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

查看答案