Question

Do you know why different animals or pests(昆虫) have their special colors? Their colors seem to be used mainly to protect themselves.

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

Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid when they face danger. While the liquid spreads over(散开)，their enemies cannot find them. And they immediately swim away. So they have lived up to now though they are not strong at all.

1.From the passage，we learn that locusts ________．

A.change their colors to protect themselves

B.are dangerous to their enemies

C.are easily found by birds

D.are small animals

2.How can pests with different colors from plants keep out of danger?

A.They have the colors much like the enemies.

B.They hide themselves by day and appear at night.

C.They run away quickly.

D.They have to move quietly.

3.Bears and lions can keep safe because ________．

A.they live in forests

B.they have the colors much like the trees

C.they move quietly

D.they like brown and gray colors

4.Why can the fish mentioned(提到) in the last paragraph live up to now?

A.Because they are very big and strong.

B.Because the liquid they send out can help them escape from their enemies.

C.Because they swim faster than any other fish.

D.Because the liquid they send out can kill their enemies.

5.Which is the best title for this passage?

A.Colors of Different Animals and Pests

B.The Main Use of Colors for Animals and Pests

C.The Change of Colors for Animals and Pests

D.Some Animals and Pests

Answer 1