求解一题

TimZ · 发表于 2011-11-22 13:32:44

During each year of the last five years,both the demand for container and the quantity of containers recycled to produce new containers have increased steadily.At the same time, the number of freshly cut tree used to produce containers has declined each year.
if the statements above are all true,they provide most support for which of the following conclusions about the last five years?

(A)The number of new containers not made of recycled materials has decreased.
(B)...
(C)...
(D)The number of containers made of tree materials has decreased.
(E)...

求解怎么分析A 和 D？？

sdcar2010 · 发表于 2011-11-22 22:22:34

A)

It's simply math. If freshly cut trees were decreased, then new containers made from freshly cut trees were decreased. Since the total number of containers increased, then A) has to be right.

D) on the other hand is wrong since all containers were made from tree materials and the total number of containers increased.

HarrisZheng · 发表于 2011-11-22 23:05:09

不同意ls的应该选D
total有没有增加是不知道的条件只说了demand增加没说supply增加
the number of freshly cut tree used to produce containers has declined each year 自然导致The number of containers made of tree materials has decreased

sdcar2010 · 发表于 2011-11-23 02:32:50

Recycled tree materials are STILL tree materials. Even if new tree materials decreased, the vastly increased recycled tree material would more than make up the shortfall and increase the TOTAL amount of tree materials for containers.

As to A), even if the total number of containers did not increase, since 1) the new containers made from freshly cut trees decreased; 2) new tree materials are not recycled materials; then the new containers made from NON-recycled materials (a.k.a new tree materials) decreased.

xp2011 · 发表于 2011-11-23 09:56:29

LS is totally committed to fraudulent logic.

A and D are both questionable on the ground that the information presented in the stiumuli is insufficient.

Here is the mathmatical equation:

Total demand = newly cut + recycled + other unstated sources. (You must not assume all containers are simply made of either newly cut trees and recycled tree materials. What about tree material inventory that has been cut years ago? )

Now, the total demand and recycled have increased, the non-recycled representing newly cut and other unstated sources does not necessarily decrease, since information regarding other unstated sources is unknown.

Thus, A is not right, D is subject to the same issue.

sdcar2010 · 发表于 2011-11-23 21:37:17

The problem with the above analysis is that it treats "other unstated sources" as "non-recycled", which has no proof in the passage. In fact, there is no mention of "other unstated sources" in the passage, either. It could very well be the opposite: "other unstated sources" belongs to "recycled."

求解一题

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