标题: 【请教】Prep 07 23 [打印本页] 作者: 鬼枂YY 时间: 2013-3-26 18:53 标题: 【请教】Prep 07 23 原题: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.
这里如果回收了玻璃和铝,则总重量前后是会改变的。
比如原来重100KG的垃圾;
回收后变成了30KG的垃圾;分母变了作者: 贝西文迅 时间: 2019-8-29 12:15
Mark一下! 作者: Bensontuo 时间: 2019-8-29 12:49
Spot the question type: Infer/ Support
Structure of the argument
Background info ( the percentage of beverage containers accounted for total weight of household garbage in usa is steadily decreasing ) Evidence of that info ( Recycling aluminum and glass for the most of weight decline ). Concession of that evidence ( more aluminum be recycled than glass be recycled ), and then the other fact " seems" to be contracted with the infos be offered ( the declined percentage of glass weight is way larger than the declined percentage of aluminum )
Well... we are actually comparing 4 different " percentages "
1. Total percentage of weight reduced
2. The percentage of the reduced weight of aluminum and glass
3.The differences of the percentages of weight reduced between Glass of 1978-1988 and Glass of prior to 1977
4. The differences of the percentages of weight reduced between Aluminum of 1978-1988 and Aluminum of prior to 1977