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Water is the life of our earth．It's 1 for us．It makes up the l 2 part of the human body．
It covers most parts of the earth．It's in lakes, rivers, seas and oceans．We can swim in lakes or rivers．I think it's more 3 than other sports in summer, It can give us j 4 ．
There are t 5 of fishes in seas and oceans．Whales live in oceans．They are the largest and heaviest animals in the world．But now they are in 6 ．Because the ocean water is becoming dirtier．
Water is so important to all living things．W 7 water, there can be 8 life on earth．So we must save every drop of water．
If you look down at our planet from outer space, most of what you see is water. In fact, oceans and seas cover more than 70 per cent of the planet's surface. Millions of years ago, there were no oceans on the earth. The surface of the earth was very hot, so water boiled away. As the earth cooled down, steam in the air began to fall down as rain. It rained and rained for many thousands of years and made the first seas on the earth.
Oceans are a large and wonderful world full of strange and interesting animals and plants. More than 275,000 kinds of fish and other animals live in the ocean. Most of them live in the surface waters because there is enough food there. But there are also some unique animals in the deepest part of the ocean. Some animals live their whole life in the ocean (such as whales) and others can spend time in the ocean or on land (such as sea lions). They are very important to our life.
Believe it or not, half of the oxygen
（氧气）we breathe is produced by algae（藻类）, the oldest plants on the earth! Each year we eat about 29 million tons of fish, much more than cattle, sheep and eggs. Without the oceans, we cannot live!The oceans are also rich in minerals
（矿物）, oil and natural gas and many other resources. Every natural element can be found in the ocean. About 3.5 per cent of ocean water is made up of salt which we eat every day. Nearly one-third of the world's oil comes from our oceans. In fact, there is a lot of gold in ocean water, too. If all the gold in the world's seawater were mined（提炼）, each person on the earth could have about four kilograms of gold!True or false:
(1) Water covers over 70
％ of the earth's surface.( )
(2) Oceans are a large, wonderful world full of strange, interesting animals.
( )
(3) All the animals in the oceans live in the surface waters.
( )
(4) The oceans gave us the air we breathe and the food we eat.
( )
(5) The oceans are full of gold to keep everyone happy.
( )
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If you travel by a1 across the centre of Africa or South America,you fly over forests for thousands of kilometres.These great forests are the oceans of t2 ndline.There are thousands and thousands of different kinds of plants and a3 ndline.
However,the world's forests are getting s4 all the time.In many places,we're cutting down the trees because we need wood and we need more farmland.Some people say that t5 will not be any forests like these in 30 years；what will happen if they d 6 ?
If we cut down our forests,a lot of plants and animals will disappear from the w7 ndline.In a lot of places the new farmland will soon look like the old d8 ndline.Crops will not grow there.It will not rain very often,and the weather will get very hot.P9 the climate of the world will change.This will be dangerous fdr everyone in the world.That's w10 we must take care of our forests.
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