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Do you know why different animals or pes...

Do you know why different animals or pests have their special colours? Colours 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 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 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.

1.From the passage we can learn that locusts       .

A. are small animals

B. are easily found by birds

C. are dangerous to their enemies

D. change their colours to protect themselves

2. 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.

3.Bears and lions can keep safe because they       .

A. have the colours much like the trees        B. move quickly

C. like brown and grey colours                  D. live in forests

4.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

5.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

 

1.D 2.C 3.A 4.B 5.A 【解析】 试题分析:短文大意: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.D细节理解题。根据第二段中It is because locusts change their colours together with the change of the colours of crops.可知蝗虫随着庄稼颜色的改变改变自己的颜色来保护自己。所以该选D。 2.C细节理解题。根据第二段中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.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,所以选C。 3.A细节理解题。根据第二段中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.可知熊,狮子和其他动物静静地穿过森林。他们不会被猎人发现。这是因为他们有很像树的颜色。所以该选A。 4.B细节理解题。根据第三段中While the liquid spread over, the enemies cannot find it. And it immediately swims away.可知这种鱼喷出的液体使敌人找不到它,然后马上逃离,所以选B。 5.标题归纳题。根据文中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.可知本文主要介绍害虫和动物身上的颜色的用途。所以选C。 考点:科普类阅读。
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