【正文】 the earth’s surface .It pollutes soil,wave ,atmosphere and damages our health. The adults often say “The body is capital.” But why are they able to make woollen cloth like this ? Does it affect everybody’s safe and sound life ?　　Schoolmates, we are the host of society tomorrow . It’s our duty to improve and build the safe invironment. Safety is in our hands .We must take park in more environmental protection activities, Plant more trees and flowers to make us live in a beautiful home with the blue sky ,blue water and green land forever.　　Safety is in our hands . Please try your best to tell people around you to deal with the rubbish , and to make a contribution to building our safe hometome .My dear Teachers，fellow students and friends： Good afternoon．As we all know, the earth is a planet almost covered by water，and it is water made every thing on the earth lively．Water is also one of the important part of our environment．Though，is there really so much water for us to clean，to produce many things，to play with? how much water are there on the earth then? Most of the water is in the oceans or locked away as ice．The largest volumes of fresh water are stored underground as groundwater，imagine there is only one barrel of water in the world，then there is only a spoon of it on the land，and the water we can use is only a drop of it．Now I have to remind all of you here that the single drop of water is never as Clean as before，it has been polluted severely by our human beings． There is a very beautiful river in Paris．It is the Seine，it runs across the City，people drink coffee, chat on the bank in the day，at night，they enjoy the beautiful scenery in the boat，songs from the river fly into the Sky made the river more attractive, the Seine is a famous symbol of France；on the west coast of pacific ocean there lies the modern City Shanghai，another river which used to be a very important transportation route runs through the center of the city，people respected and regard it asmother．It is thesuzhou river，but l believe that few of you would sit beside it，people will be scattered by the terrible smell of water when walk by．I have to say it is extremely dirty! And we all know that a lot of beautiful rivers in the world also are Sharing the same fate with suzhou river． Who is the devil? I can39。t clean itself. Compared with the dramatic development in many sides of Shanghai, the suzhou river has bee a black point of the appearance of city.Fortunately, the government has control the situation now, we are happy to see some parts of the river has bee clean again, and we even can find fish sometime.The unique earth is the only planet full of lives, the water is just like the blood in the active body, protecting water is saving ourselves. Not to waste a single drop of water, otherwise, the only drop of water we could keep in the future would be our tear! My dear friends, mankind still faces a great difficulty in solving the problems of the environment and development, and there is a grand task to perform and along way to go. The middle school students in China will always cooperate with the young people of the world