PREP里面一道CR，关于beverage container的

ericot701

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.

答案是C。想不明白

fxj85

同问

周末愉快

1978 到1988,饮料容器占家庭垃圾重量逐年递减.原因是由于广泛开展回收铝瓶和玻璃瓶的活动.

然而,尽管铝瓶回收比玻璃回收更普遍,却发现玻璃瓶的垃圾比重比铝瓶减的更快.

所以答案C:

生产的厂家都不用玻璃瓶了,怎么会有玻璃瓶的垃圾呢.自然就回答疑问了.

vannyzi

一开始我选的是A，觉得玻璃比铝瓶比重是导致玻璃下降显著的原因。后来认真看却发现题目说的是“the weight of glass bottles in household garbage declined by a greater percentage than the weight of aluminum cans.”问的是percentage，而不是净重的减少，比的是相对重量，因此与净重无关。这样一来，就与存在的数量有最直接的关系了。