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    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.
    【小题1】From the passage we learn that locusts________.
    A．are small animalsB．are easily found by birds
    C．are dangerous to their enemies D．change their colors to protect themselves
    【小题2】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.
    【小题3】Bears and lions can keep safe because _________.
    A．they have the colors much like the treesB．they move quietly
    C．they like brown and gray colorsD．they live in forests
    【小题4】Why can the kind of fish live up to now?
    A．Because it is very and strong.
    B．Because the liquid it sends out can help it escape from its enemies.
    C．Because the liquid it sends out can kill its enemies.
    D．Because it swims faster than any other fish.
    【小题5】Which is the best title for this passage?
    A．The Change of Colors for Animals and PestsB．Colors of Different Animals and Pests
    C．The Main Use of Colors for Animals and PestsD．Some Animals and Pests

    【小题1】D
    【小题1】C
    【小题1】A
    【小题1】B
    【小题1】C解析:
    略
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