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Pollution is a“dirty”word.To pollute means to contaminate-topsoil or something by introducing impurities which make(31) ___unfit or unclean to use.Pollution comes in many forms.We see it,smell it,(32) ___it,drink it,and stumble through it.We literally lived in and breathe pollution,and(33) ___surprisingly,it is beginning to(34) ___our health,our happiness,and our civilization.
Once we thought of pollution(35) ___meaning simply the smog--the choking,stinging,dirty(36) ___that hovers over cities.But air pollution,while it is(37) ___the most dangerous,is only one type of contamination among several(38) ___attack the most basic life functions.
Through the uncontrolled use of insecticides,man has polluted the land,(39) ___the wildlife.By(40) ___sewage and chemicals into rivers and lakes,we have contaminated our(41) ___water.We are polluting the oceans,too,killing the fish and(42) ___depriving ourselves(43) ___an invaluable food supply.
Part of the problem is our exploding(44) ___.More and more people are producing more wastes.But this problem is intensified by our“throw—away”technology.Each year Americans(45) ___of 7 million autos,20 million tons of waste paper,25 million pounds of toothpaste tubes and 48 million cans.We throw away gum wrappers,newspapers,and paper plates.It is no longer wise to(46) ___anything.Today almost everything is disposable. (47) ___of repairing ...