题目内容：

    You may think that you know the world well.In fact,the world we live in is full of interesting things. Do you know the following things?

◆Chocolate tastes nice but you can’t give it to little dogs,because it can kill them and  make them die.

◆We may sleep for eight hours in the night but a snail (蜗牛) may sleep for three years.

◆Our ears and noses become bigger when we grow up but eyes keep the same.

◆You may think a bear walks slowly. In fact, it can run as fast as a horse.

◆Cats won’t die if they fall off  high places because they can turn themselves up the right way.

◆The largest animal on the earth is the blue whale (鲸). It weighs(重) about 80 tons (吨)—more than 24 elephants.

◆Most animals will die soon if they lose the head. But a cockroach (蟑螂) can live for nine or ten days when they have no head.

◆Most birds are good at flying.But not all birds can fly. About forty kinds of birds can’t fly.

◆The penguin can swim very well,but it never flies.And the ostrich(鸵鸟) can't fly,either..

1.If you give chocolate to little dogs,the chocolate may kill them.

2.A bear runs more slowly than a horse.

3.Without a head,a cockroach will die soon.

4.A blue whale is much heavier than an elephant.

5.When we grow,our eyes grow,too.