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  3. As a result of pollution, Lake Erie, on the borders of the U. S. A. and Canad

As a result of pollution, Lake Erie, on the borders of the U. S. A. and Canad

游客2025-07-25  8
问题    As a result of pollution, Lake Erie, on the borders of the U. S. A. and Canada, now does not have many living things.
   Pollution in water is not simply a matter of "poisons" killing large numbers of fish overnight.
   Very often the effects of pollution are not noticed until many months or years later because the first organisms (生物) to be affected are either plants or planktons (浮游生物). These organisms are the food of fish, birds, and other creatures. When this food disappears, the fish and birds would die too. In this way a whole food chain can be wiped out, and it is not until dead fish and water birds are found at the river’s edge or on the sea shore that people realize what is happening.
   Where do the substances that pollute the water come from? There are two main sources, sewage (生活污水) and industrial waste. As more detergent (洗涤剂) is used in the homes, more of it is finally put into our rivers, lakes and seas. Detergent harms water birds by breaking down the natural substances which keep their feathers waterproof. Sewage itself, if not properly treated, makes the water dirty and prevents all forms of life in rivers and the sea from receiving the oxygen they need. Industrial waste is even more harmful since there are more highly poisonous materials in it, such as copper and lead.
   So, if we want to stop this pollution, the answer is simple. Sewage and industrial waste must be made clean before flowing into rivers and seas. It may be already too late to save some rivers and lakes, but others can be saved if the correct action is taken at once. [br] What is the meaning of the word "waterproof" in the fourth paragraph?
选项 A、Covered with water.
B、Full of water.
C、Cleaned by water.
D、Not allowing water to go through.
答案 D
解析 判断题。根据常识，鸟的翅膀部是不透水的。另外，考查构词法：proof与其他名词构成复合词。此复合涮的意思是“穿不透的；防…的；耐…的”，如heatproof“耐热的”；rustproof“防锈的”；airproof“不透气的”。所以本题答案是[D]
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