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. 答案為C 我知道其它選項為什麼錯，但不知道答案為什麼對 答案說製造商用塑膠容器取代了glass bottles，但很少aluminum cans被取代。 我不理解的是題目是玻璃和鋁二者之間的垃圾減少百分比在比較， 為什麼跑出一個塑膠容器也可以比較？ 做題時一看到這個選項，馬上就用無關做刪除了 = =" 誰可以告訴我答案和原文的連結點啊~~~~~~感謝啦 ^+++^ --

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