请教prep07-cr23

my8822180001

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.

我是想问下A肿么理解？如果说相同大小的玻璃瓶和铝罐比起来玻璃瓶更重的话，相对占垃圾重量的比例也就大，假设玻璃瓶和铝罐都是回收两个，玻璃瓶减少的重量肯定占垃圾的比重更大，这不就解释了铝罐减少的重量少并不能说明回收的量少麽？我一直的概念就是，解释题是用前头的信息结合常识解释来着......

还有就是，答案C里的塑料容器我一开始给当无关词排除了......想请教NN们，通常无关词指的是哪种类型的捏？

victoria_cc

A无法解释上面的现象，只是一个事实陈述，答案是说由于制造商比较少制

造玻璃瓶而更倾向于制造塑料瓶，所以家中的玻璃瓶少了，所以垃圾中玻璃

瓶的比重少了，从而重量少了。这是用一个现象来解释另一个现象。FYI

my8822180001

我明白你的意思，是说流通中的玻璃瓶本身就少了，但我还是不太明白A为什么解释不了，不好意思哈，我不是较真儿，我是觉得A是常识来着.....

xiaoguolulu

我说说我的看法,其实这道题很搞笑,绝对不能被题里的内容影响,
题目说的意思是铝的回收得到更广泛的应用,但是为甚麽居民的垃圾里面玻璃的重量的百分比比铝罐的重量的百分比下降的还快.
C说厂家把大部分的玻璃罐换成了塑料罐,也就是说源头上居民买的玻璃罐就少了,自然重量就小了,这和回不回收没关系,因为原来居民买的玻璃罐都变成了塑料罐.
A的话玻璃罐比铝罐重其实没有任何关系,题里面比的是以前的玻璃罐的重量和现在的玻璃罐的重量的百分比和铝罐下降的百分比,记住是百分比,所以和各自的重量没关系,就算玻璃罐比铝罐重,百分比下降的慢还是下降的慢,所以千万不要把铝罐和玻璃罐比,而是把各自的以前和现在的重量比,

james2201

说得非常好~我原来看到C选项突然多了一个plastic containers正要当做无关概念排除，但想到题干是两者的比较而选项应该也有比较，这个就当做contender先保留下来。