求解0G2017分册167题

ayaharuka

Colorless diamonds can command high prices as gemstones. A type of less valuable diamonds can be treated to remove all color. Only sophisticated tests can distinguish such treated diamonds from naturally colorless ones. However, only 2 percent of diamonds mined are of the colored type that can be successfully treated, and many of those are of insufficient quality to make the treatment worthwhile. Surely, therefore, the vast majority of colorless diamonds sold by jewelers are naturally colorless.

A serious flaw in the reasoning of the argument is that

(A) comparisons between the price diamonds command as gemstones and their value for other uses are omitted

(B) information about the rarity of treated diamonds is not combined with information about the rarity of naturally colorless, gemstone diamonds

(C) the possibility that colored diamonds might be used as gemstones, even without having been treated, is ignored

(D) the currently available method for making colorless diamonds from colored ones is treated as though it were the only possible method for doing so

(E) the difficulty that a customer of a jeweler would have in distinguishing a naturally colorless diamond from treated one is not taken into account





正确答案是B， 我搜到其他论坛的解释，但可能因为是英文的，还是不懂这个题重点在哪里。求大神解释

xxxxyu

B 的意思是：你光说 de-color diamonds 多么多么难，但是如果 natural colorless diamonds 更罕见，那就是值得的。两者的难度要结合起来看才能下定义。
A their代指gemstones
C 完全是两种东西
D 重复了原文信息
E 文章已经说需要特殊测试

Shuriiiii

xxxxyu 发表于 2017-9-24 01:29
B 的意思是：你光说 de-color diamonds 多么多么难，但是如果 natural colorless diamonds 更罕见，那就是 ...

D 为啥重复了原文信息啊？我觉得D也可以诶

honorcga

Shuriiiii 发表于 2017-10-18 11:48
D 为啥重复了原文信息啊？我觉得D也可以诶

或者你可以这么理解 D说这种De-color的方法是唯一的处理方法 与题干里说的是不是大多数的钻石是不是天然的colorless无关