【学道】2018-2019学年北师大版高中英语必修三课件 Unit 7 预习新
【学道】2018-2019学年北师大版高中英语必修三课件 Unit 7 预习新第5页

In most parts of the sea,there are plenty of fishes and plants.Some live near the top of the sea.Others live deep down.There are also millions of tiny living things that float in the sea.These floating things are so small that it is hard to see them.Many fish live by eating these.