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

　 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(蝗虫), but birds can’t 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 are 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 to protect themselves. Bears, lions, and other animals move quietly through forests. They can’t be easily seen by hunters. This is because they have the colours much like the trees.

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, its enemies can’t find it. And it immediately swims away.So it has lived up to now though it is not strong at all.

1.From the passage we 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 ou of danger?

A.They run away quickly　

B. They have the colours much like their enemies.

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

D.They have to move quietly.

3. Bears and lions can keep safe because _________.

A. they have the colours much like the trees

B.they move quietly　 C.they like brown and gray colours

D.they live in forests

4. Why can the kind of fish live up to now?

A. Because it is very strong

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

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

D. Because it swims faster than any other fish

5. 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

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（蝗虫），but birds cannot easily catch them．Why? It is because locusts change their colours together with the change of the colours of crops．Ⅵmen 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 culturing 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? 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 rived up to now though it isn’t strong at all．

1．From the passage we learn that locusts ________．

A．are small animals                                        B．are easily found by birds

C．change their colours to protect themselves    D．are dangerous to their enemies

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

A．They run away quickly．

B．They hide themselves in the day and appear at night．

C．They colours much like their enemies．

D．They have to move quietly．

3．Bears and lions can keep safe because they ________．

A．live in forests                                             B．move quickly

C．like brown and grey colours                        D．have the colours much like the trees

4．The kind of fish live up to now because ________．

A．the liquid it sends out help it escape from its enemies

B．it is very big and strong

C．the liquid it sends out can kill its enemies

D．it swims faster than any other fish

5．Which is the best title for this passage?

A．The Main Use of Colours for Animals and Pests

B．Colours of Different Animals and Pests

C．The Change of Colours for Animals and Pests

D．Some Animals and Pests

Do you know why different animals or pests(昆虫) have their special colours? Colours in them 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 colours together with the change of the colours of crops(庄稼). When crops are green, locusts look green. But as the harvest (收获)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 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 colours much like the trees.

Have you ever found an even more strange act? A kind of fish in the sea can send out a kind of very black liquid(液体) when it faces danger. While the liquid spreads over(散开), its enemies(敌人) cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all.

(   )11.From the passage we 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

(   )12.How can pests with different colours from plants keep out of danger?

A. They run away quickly.

B. They have the colours much like their enemies.

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

D. They have to move quietly.

(   )13.Bears and lions can keep safe because________.

A. they have the colours much like the trees

B. they move quietly

C. they like brown and grey colours

D. they live in forests

(   )14.Why can the kind of fish live up to now?

A. Because it is very big and strong.

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

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

D. Because it swims faster than any other fish.

(   )15.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.