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From 1978 to 1988,beverage containers accounted for a steadily decreasing percentage of the totalweight of household garbage in the United States. The increasingly widespread practice ofrecycling aluminum and glass was responsible for most of this decline. However, although aluminum recycling was morewidely practiced in this period than glass recycling, it was found that theweight of glass bottles in household garbage declined by a greater percentagethan the weight of aluminum cans. Which of the following,if true of the United States in the period 1978 to 1988, most helps to accountfor the finding? (A) Glass bottles aresignificantly heavier than aluminum cans of comparable size. (B) Recycled aluminumcans were almost all beverage containers, but a significant fraction of therecycled glass bottles had contained products other than beverages. (C) Manufacturersreplaced many glass bottles, but few aluminum cans, with plastic containers. (D) The total weight ofglass bottles purchased by households increased at a slightly faster rate thanthe total weight of aluminum cans. (E) In many areas,glass bottles had to be sorted by color of the glass before being recycled,whereas aluminum cans required no sorting.
A和C都可以解释题目中的矛盾啊，为什么正确答案是C？
我觉得A对是因为题目中说的是weight而不是数量在下降。即使玻璃瓶的数量下降少于铝罐，但只要重量下降就行啦~~~ | 
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发表于 2013-7-4 19:15:10
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