Question

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. When crops are green, locusts look green. But as the harvest（丰收） 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（立刻）swims away. So it has lived up to now though it is not strong at all.

1.From the passage we learn that locusts________.

A. are small animals    B. change their colors to protect themselves

C. are dangerous to their enemies

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.

3.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

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.

5.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

Answer

1. B

2. C

3. A

4. B

5. C

【解析】

试题不同的动物或昆虫有它们特殊的颜色，本文主要说明了它们用自身的颜色来保护自己。

1.总结归纳题。根据第一、二段可知，蝗虫改变颜色来保护自己。故选：B。

2.细节理解题。根据第二段最后两句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.可知，与植物不同颜色的昆虫脱离危险的方法是：它们白天躲起来，晚上出现。故选：C。

3.细节理解题。根据第三段最后两句They cannot be easily seen by hunters（猎人）. This is because they have the colors much like the trees.可知，熊和狮子可以保持安全，因为它们的颜色很像树。故选：A。

4.总结归纳题。根据最后一段可知，这鱼能活到现在是因为喷出的液体能帮助它从敌人那里逃脱。故选：B。

5.主旨大意题。根据文意可知，本文主要介绍了动物和害虫的颜色的用途，所以“The Main Use of Colors for Animals and Pests”符合文意。故选：C。