水汙染Water Pollution

WaterPollution

　　Water pollution is caused by waste from factories and cities. Oceans are able to clean themselves, but certain seas,once they become dirty, are not able to do so. One example is the Mediterranean which lies between Europe and Africa. It has onlyeone narrow entrance to the ocean in the west. On quarter of the shores of the Mediterranean are polluted and are no longer safe for swimming, as a lot of diseases are present in the water. In most places it is not safe to eat the fish.

　　Lakes also have the same problems. Lake Baikal in Asia was once the cleanest in the world, with over 700 different kinds of plant and animal life. Now, however, the waters of this great lake, which is also the world's deepest （over 1,740 metres）, have been dirtied by waste from a chemical factory.

　　In 1989 an oil tanker hit a rock off the northwest coast of Alaska. 35,000 tons of oil poured into the sea. The accident was one of the worst in history. More than 34,000 birds and

　　10,000 animals were killed. 4,800 square kilometres of ocean were polluted.

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　　水汙染發生在江海湖泊。作者擧例說明一些海域及湖泊的汙染原因及狀況。讀者可用此題目從不同的角度加以描述或議論。

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　　水 汙 染

　　水的汙染是由於工廠和城市的廢物引起的。大洋能夠自身清除汙染，但是某些海域一旦被汙染，卻沒有自身清汙的能力。位於歐洲和非洲之間的地中海就是一個例子。它衹在西部有一個狹窄的通往大洋的入口。四分之一的地中海海岸被汙染了，而且由於水中帶有大量病菌，所以在水中遊泳就不再安全了。大多數地方，喫魚也不保險。

　　湖泊也遇到了同樣的問題。亞洲的貝加爾湖曾經是世界上最清潔的湖，湖裡有700多種不同的植物和動物。而如今這個大湖——也是世界上最深的湖（1 740多米深）——湖水已經被一家化工廠的廢物汙染了。

　　1989年，一艘油輪在阿拉斯加西北海岸的海麪上觸礁，35 000噸油傾入大海。這是歷最嚴重的事故之一。34 000多衹鳥和10 000多頭動物死亡，4 800平方公裡的海洋受到汙染。