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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 colours 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.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

4.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.B 4.C 【解析】 试题分析:本文讲述了颜色对动物的保护作用,不同的动物用不同的方法保护自己:有的靠变色、有的靠喷出液体、有的夜晚出来。 1.D推理判断题。根据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.可知蝗虫靠改变自身颜色来保护自己,故选D. 2.C细节推理题。根据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.可知没有保护色的动物只能白天把自己藏起来,晚上才出来。故选C. 3.B细节推理题。根据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.可知这种鱼靠喷出黑色液体来保护自己逃脱,故选B. 4.Colours in them seem to be used mainly to protect themselves.可知颜色对动物有保护作用。故标题为:颜色对动物和昆虫的主要作用。故选C. 考点:考查科学类短文阅读。
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