完形填空。Weknowthattreesareusefulin

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. A. tell
(     )2. A. not
(     )3. A. cut down
(     )4. A. many
(     )5. A. how big
(     )6. A. trees
(     )7. A. big
(     )8. A. climate
(     )9. A. about
(     )10. A. when

B. ask
B. too
B. climb up
B. every
B. how long
B. leaves
B. thin
B. trees
B. to
B. where

C. offer
C. to
C. walk past
C. the first
C. how old
C. people
C. large
C. things
C. with
C. how

D. get
D. also
D. look at
D. from
D. how much
D. rings
D. thick
D. animal
D. in
D. while

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