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题库 / Prep2007E1-CR-23
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?
Glass bottles are significantly heavier than aluminum cans of comparable size.
Recycled aluminum cans were almost all beverage containers, but a significant fraction of the recycled glass bottles had contained products other than beverages.
Manufacturers replaced many glass bottles, but few aluminum cans, with plastic containers.
The total weight of glass bottles purchased by households increased at a slightly faster rate than the total weight of aluminum cans.
In many areas, glass bottles had to be sorted by color of the glass before being recycled, whereas aluminum cans required no sorting.
1978-1988，美国的生活垃圾中，饮料瓶所占的重量比重下降了。铝和玻璃回收对这种下降起了作用。但是，虽然铝比玻璃更多的回收，在生活垃圾中玻璃瓶子所占的重量比重下降的比铝多
解释题 分析题目，出现矛盾，铝比玻璃回收多，但玻璃占重量下降比重还更大，需解决矛盾
(A)玻璃瓶同等大小比铝罐重很多；但铝回收更多，无关比较，排
(B)回收的铝罐几乎都是饮料罐，而回收的玻璃瓶很大部分不是饮料瓶；瓶子或罐子是否装饮料显然无关，排
(C)生产商把很多玻璃瓶换成了塑料瓶，而铝罐没怎么换； 虽然铝回收比玻璃多，但生产阶段玻璃瓶就少了很多，变成了塑料瓶，于是变成垃圾的玻璃瓶就少了，从而解释了原文矛盾，正确
(D) 被买的玻璃瓶总重量比铝罐总重量增长快一点；重量增长快，并不能说明重量更多，排
(E) 很多地方，玻璃瓶在回收前按颜色分类；铝罐不分类；分不分类与回收的重量显然无关，排。
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