Question

Have you wondered why different animals or pests have their particular colours? Colours in them seem to be used mainly to protect themselves.

Birds, especially seagulls are very fond of locusts (蝗虫), but birds can’t easily catch locusts because locusts change their colours together with the change of the colour of crops. When crops are green, locusts look green. But when crops are ripe, locusts take on exactly the same brown colour as crops have. Some other pests with different colours from plants are usually easily found and eaten by their enemies. So they have to hide themselves in terror for lives and appear only at night.

If you study the animal life in any part of the world, you will find the main use of colouring is to protect them. Bears, wolves and other beasts move quietly through forests. They are usually invisible(can’t be seen) to the eyes of hunters, because they have the colour much like the bark（树皮）of trees.

An even more strange act remains to be noticed. A kind of fish living in seas can send out a kind of very black liquid when it faces danger. While the liquid is over, its enemies cannot find it, and it quickly swims away. Thus, it has existed up to now though it is not powerful at all.

1.This passage mainly talks about _______.

A.the change of colour in locusts

B.animals or pests can dye（染色）themselves different colours

C.how a certain sea fish protects itself

D.the protective colour of animals and pests

2.Locusts are pests but they aren’t easily wiped out by their enemies because _______.

A.they change colors with the crops

B.they are dangerous to their enemies

C.they fly very fast

D.they are powerful enough

3.The pests that have different colours from plants usually appear at night because _______.

A.their enemies can easily find them and eat them

B.they have the habit of coming out in darkness

C.it’s easy for them to destroy plants in darkness

D.birds take their rests when night comes

4.A certain fish living in seas has lived through millions of year because _______.

A.it is the most powerful in the sea

B.no other fishes can swim as fast as it can

C.it can send out a kind of liquid which makes its enemies unable to find it

D.the liquid it sends out can kill its enemies

Answer

1.D

2.A

3.A

4.C

【解析】

这是一篇说明文。 这篇短文主要介绍了为什么不同的动物或害虫有其特殊的颜色。它们的颜色主要用于保护他们自己。作者列举了蝗虫，狮子，鱼等动物说明这一观点

1.主旨大意题。根据第一段Have you wondered why different animals or pests have their particular colours? Colours in them seem to be used mainly to protect themselves.可知，你有没有想过为什么不同的动物或害虫有它们独特的颜色?它们的颜色似乎主要是用来保护自己。所以文章主要谈论的是动物使用颜色来保护自己的问题，故选D项。

2.细节理解题。根据第二段提到Birds, especially seagulls are very fond of locusts (蝗虫), but birds can’t easily catch locusts because locusts change their colours together with the change of the colour of crops可知，蝗虫可以把身体的颜色与庄稼变成一样的颜色，不容易被鸟发现。故选A项。

3.细节理解题。根据第二段Some other pests with different colours from plants are usually easily found and eaten by their enemies. So they have to hide themselves in terror for lives and appear only at night.

可知，其他一些颜色与植物不同的害虫通常很容易被它们的敌人发现和吃掉。所以他们不得不在恐怖中躲藏起来，只在晚上出现。所以与植物颜色不同的害虫通常在晚上出现，因为它们的敌人很容易找到并吃掉它们。故选A项。

4.细节理解题。根据短文最后一段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.可知, 当鱼遇到危险时，海里的一种鱼会散发出一种黑色的液体。 液体迅速扩散，所以它们无法被敌人发现，可以迅速游走。所以某一种生活在海洋中的鱼类，已经存活了数百万年是因为它发出来的液体能帮它躲避敌人。故选C项。