1、 1Ocean is the cradle of life.海洋是生命的摇篮。2Save our ocean for the sake of life on the earth.为了地球上的生命拯救我们的海洋吧。3Fish cant stir the sea，fog cant overwhelm the mountains.鱼搅不浑大海，雾压不倒高山。4The sea is not afraid of more rain，but a good man is not afraid of more difficulties.大海不怕雨水多，好汉不怕困难多。5The big boat needs t
2、o go deep and the dragon needs to swim in the middle of the sea.大船要走深水，蛟龙要在海中游。Some people have seen the sea，but others havent.The sea looks beautiful on a fine day.But it can be very rough when there is a strong wind.The sea is very large.There is more sea in the world than land.If you have swum in
3、 the sea，you know that the sea is salty.Do you know the Dead Sea? It is so salty that you cant sink when you are in the water.And fish cant live in it!All living things must fight to stay alive.They have to feed on something and at the same time avoid being eaten.Therefore they have to solve this bi
4、g problem of staying alive in their own way.The danger of being eaten in the sea is great.Those plants and animals that do survive usually reproduce very fast and in great numbers.Certain sea animals have defensive devices(装置) which help them to survive.The jellyfish have poisonous tentacles(触角) whi
5、ch are used for attack and defence.Another method of survival which sea plants and animals use is disguise(伪装)They usually have the same color as their surroundings.In order to stay alive，animals need to have good senses.Fishes have sharp eyes.Almost all animals are sensitive to touch.Fishes judge m
6、ovements in the water by means of their lines.Fishes and other sea animals can hear well and many of them can make different types of warning sound.探索发现1What is the greatest problem that the living things face?They have to live on in their own way.2What do the jellyfish have to protect themselves from being attacked?They have poisonous tentacles which are used for attack and defence.3List at least two methods of helping animals survive.Reproducing very fast and in great numbers.Disguising/Certain defensive devices.Good senses (of animals)