请教一道prep逻辑题

presillia

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.

为什么A不对呢？谁能帮忙分析下。谢谢！

easttiger

原文讲因为铝罐和玻璃瓶回收的做法越来越多，导致了家庭垃圾中饮料盛器的重量比例大大减少。然后说两种材料回收相比，铝罐回收比玻璃瓶更普遍，但是在家庭垃圾重量中的比例是玻璃瓶下降得更多。

A说玻璃瓶比铝罐重得多，这个能help to account for的，先保留。因为即使玻璃瓶回收得不如铝罐普遍，但是回收一只玻璃瓶能抵十只铝罐的话还是能说明玻璃瓶比较贡献大。

B说因为原文前提限定在饮料盛器，而回收的铝罐都是饮料盛器，回收的玻璃瓶却有很多不是用来盛饮料的，那这只能帮助说明铝罐的贡献比较大。

C说因为来自manufacturer的关系，本身玻璃瓶用的少了许多，那么扔掉的和回收的可以同时减少，不一定扔掉和回收两个方面一定要此消彼长的。C这个条件要比A更强。

在C的基础上, D就不可能对了，买入的量比人家多，扔掉和回收的都相比人家少，那多出来的难道存着?

E不对，E只能说明因为怕麻烦而减少了玻璃瓶回收，但不能说明为什么被扔掉的玻璃瓶少了许多。

所以应该选C吧?

presillia

谢谢！