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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。因为铝和玻璃都被回收了。但是，虽然铝比玻璃回收的更多，但在生活垃圾中玻璃瓶子所占的重量比重下降的比铝多。问哪项可以解释。
此题只考虑回收的量铝更多，但如果玻璃瓶使用得就少的话，一样可以解释题目中描述的现象。即C选项。A选项虽然glass bottle比铝盒重，但在不知glass bottle和铝盒的总的回收量的情形下无法解释现象。D选项犯和A选项一样的错误。E选项是无关选项。B选项是无关选项。
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