Prep1-23 求助

terry_run

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.

很多人看过这个题目,也提问过,但是几乎没人解释B 为什么不对. 下面是我的理解,求路过的朋友纠正... 

文中提到是 饮料瓶作为垃圾比例减少了,因为作为饮料瓶子的A CAN 和G BOTTLE 被回收了. 但尽管A CAN 回收的多,垃圾中,G BOTTLE 减少的比例还是比A CAN 大.问怎么解释?

A 的错在于,绝对量 与 相对比例的差别.A 错.

C 正确在于C 说明了 G BOTTLE 不单是被RECYCLE ,还被REPLACE, 因此下降的比ALUMINUM CAN 比例大

问题是B: B 说明回收的A CAN 之前大部分是饮料瓶,而回收的G BOTTLE 之前除做饮料瓶,大部分是其他用途的.其之前的用途对现在是否回收无关.自然无法说明 在垃圾中 G BOTTLE 为什么减少的比 A CAN 快了.

     

               

            

              B

zbna5

顶一个~~~清楚多了,谢啦

isi

以下是引用zbna5在2009-6-13 15:49:00的发言：
顶一个~~~清楚多了,谢啦

寒。。估计lz瞬间石化了。。

人家求助来着。。

ruirui_hsu

我当时选的A。 我觉得， 由于玻璃瓶回收少，但是它的重量下降的多，那就说明：收相同的重量的东西，回收的玻璃瓶的数量当然就是少了。

这不正好和玻璃瓶回收少也基本吻合吗？ 虽然回收少，但是重量下降当然明显了。

反而我觉得D项 有无中生有的感觉