A、任务性阅读

　　Colour helps you see things. But man and some monkeys and apes (猿) are

　　the only mammals（哺乳动物） that can see colours. For any other mammals,

　　such as the dog, the world looks like a black-white photo. Dogs hunt mainly by listening and smelling.

　　Like other animals, dogs see best when things move. The animals they hunt

　　Seem to know this. A rabbit or deer will freeze when they find that they are being hunted. Then the dog may not see it at all.

　　Birds can see colour. They need to, because when they fly, they need to find places to land. Colour helps them know how far the place is and what it is like so that they are able to catch flying things in the air or to land on something they think safe.

　　Some birds see things even better than man. The birds that eat bugs（虫子） can see them from far away. And even a very young bird can see a house from the sky. So good eyes and being able to see colours help birds find food and also help

　　them find out if there are other animals that are dangerous to them.

　　1. What’s the use of colours?

　　____________________________________________________

　　2. Are men the only mammals that can see colours?

　　____________________________________________________

　　3. Why does a rabbit or deer freeze when they find themselves being hunted?

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