Do you know why different animals or pests(害虫) have their special colors? Colors in them seem to be mainly used to    1   themselves.

Some birds like eating locusts(蝗虫), but birds cannot    2  catch them. Why? It is because locusts change their   3   with the change of the colors of crops. When crops are green, locusts look    4 . But as the harvest time comes, locusts change into the same brown color    5  crops have. Some other pests whose colors are   6   plants are easily found and eaten by   7  . So they have to hide themselves for lives and appear only   8  .

If you    9 animals’ life, you’ll find the main use of colors is to protect    10  . Bears, lions and other animals  11  quietly through forests. They cannot be easily seen by hunters   12  their colors are much like the trees.

Colors are useful not only on the land, but also in the   13 . A kind of fish can   14  a kind of black liquid(液体) when they face danger. The liquid spreads over quickly, so they cannot be found by their enemies and can quickly swim away. That is   15  they can live safely though they are not strong at all. So colors are really useful to animals.

1.                A．show          B．protect         C．kill  D．interest

2.                A．easily          B．freely          C．safely    D．differently

3.                A．sizes           B．smells          C．colors    D．shapes

4.                A．yellow         B．red            C．black D．green

5.                A．so             B．as             C．like  D．with

6.                A．different from   B．same as         C．similar to  D．opposite with

7.                A．other          B．others          C．the others D．another

8.                A．in the morning   B．at noon         C．at night   D．in the daytime

9.                A．study          B．write           C．draw D．work

10.               A．them          B．themselves      C．it D．itself

11.               A．run            B．fight           C．move D．eat

12.               A．because        B．so             C．and  D．although

13.               A．forests         B．desert         C．sea   D．mountains

14.               A．keep out       B．come out       C．look out   D．give out

15.               A．why           B．when          C．how  D．where

Do you know why different animals or pests(昆虫) have their special colors? Colors in them seem to be used mainly to protect themselves.

　　Some birds like eating locusts(蝗虫), but birds cannot easily catch them. Why? It is because locusts change their colors together with the change of the colors of crops(庄稼). When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown color as crops have. Some other pests with different colors from plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night.

　　If you study the animal life, you'll find the main use of coloring is to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters(猎人). This is because they have the colors much like the trees.

　　Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid(液体)when it faces danger. While the liquid spreads over(散开), its enemies(敌人) cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all.

 (    )46．How can pests with different colors from plants keep out of danger?

　　A. They run away quickly.

　　B. They have the colors much like their enemies.

　　C. They hide themselves by day and appear at night.

　　D. They have to move quietly.

(    )47．Bears and lions can keep safe because______.

　　A. they have the colors much like the trees　　 B. they move quietly

　　C. they like brown and gray colors       　　D. they live in forests

 (    )48．Which is the best title for this passage?

　　A. The Change of Colors for Animals and Pests

　　B. Colors of Different Animals and Pests

　　C. The Main Use of Colors for Animals and Pests

　　D. Some Animals and Pests

   Do you know why different animals or pests(害虫)have different colors? The colors are mainly used to protect themselves．

  Some birds like eating locusts(蝗虫)，but birds cannot easily catch them．Why? It is because locusts change their colors together with the change of the colors of the crops. When the crops are green，locusts look green．But as the harvest time comes，locus change to the same brown colors as the crops have．Some pests with different colors from the plants easily found and eaten by others．So they have to hide themselves，appearing only at night．

Some animals move quietly through forests．They cannot be easily seen by hunters(猎人)．This is because they have the colors much like the trees’．

    A kind of fish in the sea can send out a kind of black liquid(液体)when it faces danger．While the liquid spreads over，the fish’s enemies cannot find it．And it immediately swims away．So it has lived up to now though it is not strong at all．

1．From the passage we can learn that locusts________．

    A．are small animals                       B．are easily found by birds

    C．are dangerous for their enemies            D．can’t be easily caught by birds

2．How can pests with different colors from the plants keep out of danger?

    A．They run away quickly．

    B．They have the colors much like their enemies’．

    C．They hide themselves in the daytime and appear at night．

    D．They have to move quietly．

3．Some animals Can keep safe in the forest because________．

    A．they have the colors much like the trees’

    B．they move quietly

    C．they like brown and grey colors

    D．they live in the forest

4．Why can the kind offish in Paragraph4 live up to now(直到现在)?

    A．Because it is very large and strong．

    B．Because the liquid it sends out can help it escape when in danger．

    C．Because the liquid it sends out call kill its enemies．

    D．Because it swims very fast and Call escape very quickly．

5．Which is the best title for this passage?

    A．The Change of Colors．

    B．Colors of Different Animals and Pests．

    C．The Main Use of Colors with Animals and Pests．

    D．Some Animals and Pests．

Do you know why different animals or pests (昆虫) have their special colors? Colors in them seem to be used mainly to protect themselves.
　　Some birds like eating locusts (蝗虫), but birds cannot easily catch them. Why? It is because locusts change their colors together with the change of the colors of crops(庄稼). When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown color as crops have. Some other pests with different colors from plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night.
If you study the animal life, you’ll find the main use of coloring is to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters (猎人). This is because they have the colors much like the trees.
Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid (液体)when it faces danger. While the liquid spreads over (散开), its enemies (敌人)cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all

1. 1.

   From the passage we learn that locusts________

   1. A.
      are small animals
   2. B.
      are easily found by birds
   3. C.
      are dangerous to their enemies
   4. D.
      change their colors to protect themselves
2. 2.

   How can pests with different colors from plants keep out of danger?

   1. A.
      They run away quickly
   2. B.
      They have the colors much like their enemies
   3. C.
      They hide themselves by day and appear at night
   4. D.
      They have to move quietly
3. 3.

   Bears and lions can keep safe because _________

   1. A.
      they have the colors much like the trees
   2. B.
      they move quietly
   3. C.
      they like brown and gray colors
   4. D.
      they live in forests
4. 4.

   Why can the kind of fish live up to now?

   1. A.
      Because it is very and strong
   2. B.
      Because the liquid it sends out can help it escape from its enemies
   3. C.
      Because the liquid it sends out can kill its enemies
   4. D.
      Because it swims faster than any other fish
5. 5.

   Which is the best title for this passage?

   1. A.
      The Change of Colors for Animals and Pests
   2. B.
      Colors of Different Animals and Pests
   3. C.
      The Main Use of Colors for Animals and Pests
   4. D.
      Some Animals and Pests