Question

                                                                   

 b

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 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^l 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. 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 when it faces danger. While the liquid spreads over, its 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 big animals

B.    are easily found by birds

C.    are dangerous to their enemies

D.    change their colors to protect themselves

(    )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 during the day and appear at night.

D.    They have to move quietly.

(    )3. Bears and lions can not be easily seen because_.

A.    they have the colors much like the trees

B.    they move quietly

C.    they like brown and gray colors

D.    they live together

(    )4. Why can the fish mentioned in the last paragraph live up to now?

A.    Because it is very strong.

B. Because the liquid it sends out can help it escape.

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

D.    Because it swims faster than any other fish.

(    )5. Which could be the best title for the 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.

        

Answer 1

B 阅读提示：本文主要介绍颜色是如何对动物起到保护作用的。

1. D细节理解题。由第二段第三句“It is because locusts change their colors with the change of the colors of crops. ”可知，煌虫能随着周围环境颜色的变化而改变自身的颜色,以达到自保的目的。

2. C 细节理解题。由第二段最后一句“So they have to hide themselves for lives and appear only at night. ”可知，没有保护色的动物只能通过昼伏夜出的生活方式来保护自己。

3. A.细节理解题。由第三段最后一句“This is because they have the colors much like the trees. ”可知，熊与狮子自身的颜色与周围 树木的颜色很像，所以不易被发现。

4. B细节理解题。由最后一段可知，这种鱼通过喷出黑色液体影 响敌人视线来脱身。

5. C主旨大意题。结合文章大意可知最佳答案为C项，即颜色对 于动物和昆虫的保护作用。