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.

　 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. 1.
   1. A.
      tell
   2. B.
      ask
   3. C.
      give
   4. D.
      get
2. 2.
   1. A.
      not
   2. B.
      too
   3. C.
      to
   4. D.
      also
3. 3.
   1. A.
      cut across
   2. B.
      climb up
   3. C.
      walk past
   4. D.
      look at
4. 4.
   1. A.
      every
   2. B.
      many
   3. C.
      the first
   4. D.
      from
5. 5.
   1. A.
      how big
   2. B.
      how long
   3. C.
      how old
   4. D.
      how much
6. 6.
   1. A.
      trees
   2. B.
      leaves
   3. C.
      people
   4. D.
      rings
7. 7.
   1. A.
      big
   2. B.
      thick
   3. C.
      small
   4. D.
      thin
8. 8.
   1. A.
      climate
   2. B.
      trees
   3. C.
      rings
   4. D.
      animals
9. 9.
   1. A.
      people
   2. B.
      things
   3. C.
      climate
   4. D.
      life
10. 10.
    1. A.
       how
    2. B.
       why
    3. C.
       when
    4. D.
       while

根据句意和首字母提示,写出正确的单词

1.The panda comes f　　　 China.Its f　　　 food is bamboo.It can c　　　 trees.

2.The snake is Asian.　It h　　　 no friends.　It doesn't like w　　　,but the elephant likes ?water.　It can eat 600 kilos of g　　　 in a day.

3.The camel lives in the d　　　 in Africa.

4.The wolf lives in the E　　　 forest.　It likes to eat m　　　.

5.The kangaroo comes from A　　　.