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  3. People today all over the world are beginning to hear and learn more and more about the problem of pollution. (46) Pollution is

People today all over the world are beginning to hear and learn more and more about the problem of pollution. (46) Pollution is

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问题     People today all over the world are beginning to hear and learn more and more about the problem of pollution.  (46) Pollution is caused by either the release by man of completely new and often artificial substances into the environment, or by releasing greatly increased amounts of a natural substance, such as oil from oil tankers into the sea.
    (47)The whole industrial process which makes many of the goods and machines we need and use in our daily lives, is bound to create a number of waste products which upset the environmental balance, or the ecological balance as it is also known. (48) Many of these waste products can be prevented or disposed of sensibly, but clearly while more and more new goods are produced and made complex, there will be new, dangerous wastes to be disposed of, for example, the waste products from nuclear power stations.
    (49)Whatever its underlying reasons, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts. In the home there is an obvious need to control litter and waste. Food comes wrapped up three or four times in packages that all have to be disposed of; drinks are increasingly sold in bottles or tins which cannot be reused. This not only causes a litter problem, but also is a great waste of resources, in terms of glass, metals and paper. Advertising helped this process by persuading many of us not only to buy things we neither want nor need, but also to throw away much of what we do buy. (50)Pollution and waste combine to be a problem every one can help to solve by cutting out unnecessary buying, excess consumption and careless disposal of the products we use in our daily lives.  
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答案许多这样的废弃物是可以避免或妥善处理的。可是很显然，随着越来越多的新产品被生产出来，而且越加复杂，所以会有新的危险废弃物被处理，例如核电站的废物处理。
解析 本句是一个复合句，主干为many of these waste products can be prevented...，but...there will be new，dangerous，wastes to be disposed of...。其中在but引导的转折句中，clearly后面的while引导的是时间状语从句：while more and more new goods are produced and made comlplex；there will be...to be disposed of是but引导的转折句里面的主句部分；for example介词短语做插入语，后跟具体例子：the waste products from nuclear power stations．
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