Question

阅读下面短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

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, 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 spreads 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.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

3.Why can the fish mentioned in the last paragraph live up to now?

A． Because it is very strong．

B． Because the liquid it sends out can help it get away from its enemies．

C． Because the liquid it sends out can kill its enemies．

D． Because 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

Answer

1.D

2.A

3.B

4.C

【解析】

1.1】细节理解题。由短文第二段第二句：It is because locusts change their colours together with the change of the colours of crops．可知，蝗虫为了保护自己，把自己的颜色改变成为庄稼一样。故选D；

2.2】细节理解题。由第三段最后一句：This is because they have the colours much like the tree．可知因为它们的颜色像树木，所以可以保护自身安全；

3.3】细节理解题。由短文倒数第二、三句：While the liquid spreads over, the enemies cannot find it．And it immediately swims away．可知它发出的黑色液体可以帮助它逃跑，故选B；

4.4】主旨大意题。题意：短文最好的标题是什么？ A． The Change of Colours for Animals and Pests动物和害虫的颜色的改变；B． Colours of Different Animals and Pests不同动物和害虫的颜色；C． The Main Use of Colours for Animals and Pests动物、害虫的颜色的主要用途；D． Some Animals and Pests一些动物与害虫。本文主要讲述的是不同的动物、不同的害虫有着不同的颜色的原因，故选C。