Question

Do you know why different animals or pests have their special colours? Colours in them seem to be mainly used to protect themselves.

Some birds like eating locusts（蝗虫）, but birds cannot easily catch them. Why? It is because locusts change their colurs with the changes of the colours of crops .When crops are green, locusts look green .But as the harvest time comes, locusts change into the same brown colour as crops have .Some other pests whose colours are different 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 animals’ life, you’ll find the main use of colours is to protect themselves .Bears, lions and other animals move quietly through forests .They cannot be easily seen by hunters because their colours are much like the trees.

Colours are useful not only on the land , but also in the sea .A kind of fish in the sea can give out a kind of black liquid（液体）when the fish face danger. The liquid spreads over quickly, so they cannot be found by their enemies and can quickly swim away. That is why they can live safely though they are not strong at all.

1.From the passage, we can know that       .

A．locusts are big animals

B．locusts are easily found by birds

C．locusts are dangerous to their enemies

D．locusts can change their colours to protect themselves

2.Those pests with different colours from plants have to       to keep out of danger.

A．change their colours

B．hide in the day time and appear at night

C．move quietly

D．hide at night and appear in the day time

3.Bears and lions can keep safe because       .

A．their colours are much like the trees

B．they move quickly

C．they are very strong                

D．they live in forests

4.According to the passage, the fish can keep safe because       .

A．they can change their colours

B．they can give out a kind of black liquid

C．they are strong enough

D．they swim faster than any other fish

5.Which is the best title for this passage?

A．The colours of the seasons

B．Animals on the land and in the sea

C．The main use of colours for animals and pests

D．How to keep safe in the sea

Answer

1.D

2.B

3.A

4.B

5.C

【解析】

试题分析：这篇短文主要介绍不同的动物和昆虫有着它们特殊的颜色。文章介绍，动物和昆虫的颜色随着环境的变化而变化，主要目的是保护自己不受侵害。

1.第一段第二句“Colours in them seem to be used mainly to protect themselves.”及第三段的描述可知，蝗虫改变颜色是为了保护自己。故选D。

2.短文第二段最后一句“So they have to hide themselves for lives and appear only at night.”的描述可知，这些动物白天躲藏起来，晚上出来活动。故选B。

3.细节理解题。根据短文第三段最后一句“This is because they have the colours much like the tree.”的描述可知，熊和狮子可以保持安全是因为它们的颜色比较像树木。故选A。

4.最后一段A kind of fish in the sea can give out a kind of black liquid（液体）when the fish face danger. The liquid spreads over quickly, so they cannot be found by their enemies and can quickly swim away. That is why they can live safely though they are not strong at all.的描述可知,鱼能够保持安全是因为它发出来的液体能帮它躲避敌人。故选B。

5.标题归纳题。联系上下文的描述可知，本文主要介绍了“颜色对动物和昆虫的主要应用”。故应选C。

考点：科普类短文阅读。