逻辑里关于饮料瓶垃圾重量的题

wellmichelle

From 1978 to 1988, beverage containers accounted for a steadily decreasing percentage of the total weight of household garbage in the United States. The increasingly widespread practice of recycling aluminum and glass was responsible for most of this decline. However, although aluminum recycling was more widely practiced in this period than glass recycling, it was found that the weight of glass bottles in household garbage declined by a greater percentage than the weight of aluminum cans.

Which of the following, if true of the United States in the period 1978 to 1988, most helps to account for the finding?
A.Glass bottles are significantly heavier than aluminum cans of comparable size.
B.Recycled aluminum cans were almost all beverage containers, but a significant fraction of the recycled glass bottles had contained products other than beverages.
C.Manufacturers replaced many glass bottles, but few aluminum cans, with plastic containers.
D.The total weight of glass bottles purchased by households increased at a slightly faster rate than the 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.

答案选C，为什么不是A呢？
假设原有G和A都有100千克，G有10个，A有50个（G比A重很多）。现在即使A减去了很多25个，而G只减去7个，但其结果是G重量下降的更多70%，而A只降50%啊
这样不就结论成立了吗？

HarrisZheng

你这个假设和前提是矛盾的

aluminum recycling was more widely

widely其实就是百分比的概念了 而不是比较绝对数量

你不能说50%（25个）比70%（7个）更widely吧

所以 和重量是无关的

wellmichelle

原来如此，谢谢啦！你解决了我好多疑惑呢！真的非常感谢你！！！
不过你在解释“歧义”那个问题的回答是什么意思啊？
本人比较愚钝啊，不要介意~~谢谢谢谢！