Question

Do you know why different animals or pests（害虫）have their special colours? Colours 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 colours together with the change of the colours of crops. When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown colour as crops have. Some other pests with different colours 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 colouring is protecting themselves. Bears, lions and other animals move quietly through forests. They cannot be seen by hunters. This is because they have the colours 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（液体）when it faces danger. While the liquid spread over, the enemies（敌人）cannot find it. And it immediately（立即）swims away. So it has lived up to now though it isn’t strong at all.

1. How can pests with different colours from plants keep out of danger?

A. They run away quickly.

B. Their colours are much like their enemies.

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

D. They have to move quietly.

2.The kind of fish can live up to now because .

A. it is very big and strong

B. the liquid it sends out can help it escape from its enemies

C. the liquid it sends out can kill its enemies

D. it swims faster than any other fish

3. Which is the best title for this passage?

A. The Change of Colours for Animals and Pests

B. Colours of Different Animals and Pests

C. The Main Use of Colours for Animals and Pests

D. Some Animals and Pests

 

Answer 1

1.C

2.B

3.C

【解析】

试题分析：本文叙述了动物和害虫利用身上的颜色与周围的环境的颜色相近来保护自己。颜色与植物不同的害虫要脱离危险，在白天必须躲藏起来，只在夜晚出现。有一种鱼喷出的液体使敌人找不到它，然后马上逃离。

1. they have to hide themselves for lives and appear only at night.可知颜色与植物不同的害虫要脱离危险，在白天必须躲藏起来，只在夜晚出现，故选C。

2. the liquid spread over, the enemies（敌人）cannot find it. And it immediately（立即）swims away.可知因为这种鱼喷出的液体使敌人找不到它，然后马上逃离，故选B。

3. you know why different animals or pests（害虫）have their special colours? Colours in them seem to be used mainly to protect themselves.Colours in them seem to be used mainly to protect themselves.可知本文主要围绕着害虫和动物身上的颜色的用途。故选C。

考点：科普环保类短文阅读。