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.
正确答案是C, 但是为什么A不对呢？
如果说：glass重，所以在垃圾里减少的glass重量上也多？ 我觉得A也有道理？
作者: amy虫子 时间: 2010-8-19 21:05
the weight of glass bottles the weight of aluminum cans 是说各自的重量，那么重量就应该和数量成正比，比如一开始g的重量是1000*1，a的重量的1000*2，g 的重量减少50%，也就是少了500个，a的重量少了40%，就是少了400个 楼主理解错了，并不是占所有的垃圾重量的比重