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    Do you know why different animals or pests have their special colors? Colors in them seem to be used mainly to protect themselves.
    Some birds like eating locusts. but birds cannot easily catch them. Why? It is because locusts change their colors together with the change of the colors of crops. 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 protecting themselves. Bears, lions and other animals move quietly through forests. They cannot be seen by hunters. This is because they have the colors much like the tree.
    Have you ever noticed an even more strange act? A kind of fish in the sea can send out a kind of very black liquid when it faces danger. While the liquid spread over, the enemies cannot find it. And it immediately swims away. So it has lived up to now though it isn't strong at all.
    根据短文内容, 指出能完成所给句子或回答所提问题的最佳答案。
    小题1:From the passage we learn that locusts ___ .
    A．are small animals
    B．are easily found by birds
    C．are dangerous to their enemies
    D．change their colors to protect themselves
    小题2:Bears and lions can keep safe because they ___ .
    A．have the colors much like the trees
    B．move quickly
    C．like brown and grey colors
    D．live in forests
    小题3:The kind of fish live up to now because ___ .
    A．it is very big and strong
    B．the liquid it sends out help it escape from its enemies
    C．the liquid it sends out can kill its enemies
    D．it swims faster than any other fish
    小题4: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

    小题1:D
    小题2:A
    小题3:B
    小题4:C

    试题分析：这篇文章讲述了不同的动物和害虫都会有着和环境相似的颜色，这些颜色主要是用来保护它们自己不受到伤害。
    小题1:细节题。根据文章Some birds like eating locusts. but birds cannot easily catch them. Why? It is because locusts change their colors together with the change of the colors of crops.蝗虫能够随着农作物的颜色的变化而改变自己的颜色，这样就可以保护自己不被鸟类吃掉。故选D
    小题2:细节题。根据文章This is because they have the colors much like the tree.可知，那是因为熊和狮子有着和树木很想象的颜色。故选A
    小题3:细节题。根据文章A kind of fish in the sea can send out a kind of very black liquid when it faces danger.有一种鱼当它遇到危险是，就会发射出一种黑色的液体。故选B
    小题4:主旨题。这篇文章讲述了不同的动物和害虫都有着自己特殊的颜色，这些颜色主要就是用来保护自己远离危险。故本题选C
    点评：本文的思路清晰，结构明确。首先对作者所说明的事物进行理解。本文细节题很多，对于细节题，学生在理解全文的基础上要对题目中关键字在文章中迅速定位，找到相对应的出处，答题比较备选答案的区别及和文章信息最相关的是哪个，即那个就为正确答案。
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