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标题: 旧PREP逻辑疑问之1 [打印本页]

作者: harvard2012 时间: 2012-3-1 14:06
标题: 旧PREP逻辑疑问之1

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[d1]) 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.

(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.

[d1]C正确答案，可是我觉得A也对啊

作者: kevingod 时间: 2012-3-2 22:51
减少的是percentage，不是绝对重量。玻璃瓶分子大，分母也大。。。

作者: 大笑丸子 时间: 2012-3-5 22:49
比较的是：以前玻璃重量占总量百分比-（减号）现在玻璃重量占总量百分比&以前铝重量占重量百分比-现在铝重量占总量百分所以跟玻璃重量没关系～～

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