培优专项训练二 Unit 2 主题阅读训练一.完形填空AColour helps you see things. But man and some monkeys and apes(猿) are the only mammals(哺乳动物) that can see colour. __1__ any other mammals, such as the dog, the world __2__ a black white photo. Dogs hunt mainly by listening and smelling.Like __3__ 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 __4__ see it at al..