1. 阅读理解

    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 love eating locusts (蝗虫), but birds cannot easily catch them, why? It is because locusts change their colours with the change of the colours of crops. 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 living and appear only at night.

    If you study animals' life, you'll find the main use of colour is to protect themselves. Bears, lions and other animals move quietly through the forests and they cannot be easily seen by hunters. This is because they have the colours 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 (液体) when it faces danger. While the liquid spreads, its enemies cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all.

1. （1） Why CANNOT birds easily catch locusts?

   A . Because birds can see them clearly. B . Because locusts can fly more quickly. C . Because birds aren't cleverer than locusts. D . Because locusts can change their colours.
3. （2） How can pests with different colours from plants keep out of danger?

   A . They run away quickly and they can even fly. B . They have the colours much like their enemies. C . They hide themselves in the day and appear at night. D . They are able to fight against their enemies.
5. （3） Why can bears and lions keep safe?

   A . Because they have the colours much like the trees. B . Because they are the strongest animals in the world. C . Because they can change their colours into brown or gray. D . Because they live together to protect themselves.
7. （4） What can we know from the passage?

   A . All of the animals can change colours in danger. B . All of the animals can run quickly in danger. C . Animals use different skills to protect themselves. D . The fish swims faster than any other fish.
9. （5） What is the main idea of this passage?

   A . The change of colours for animals and pests. B . Colours of different animals and pests. C . The use of colours for animals and pests. D . How animals and pests live.