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 (年轮). Most trees grow one 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 very thin or suddenly very thick, this means
that the
8 changed suddenly. If we look at the rings of this tree, we can
9 about the climate for a hundred
years. 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. study ( ) 10. A. how |
B. ask B. too B. climb up B. every B. how long B. leaves B. thin B. trees B. get B. why |
C. give C. to C. walk past C. some C. how old C. people C. things C. sky C. learn C. when |
D. get D. also D. look at D. only D. how much D. rings D. small D. animal D. teach D. while |