OG 12- 84

ccx

OG12- 84
Many people suffer an allergic reaction to certain sulfites, including those that
are commonly added to wine as preservatives. However, since there are several
wine makers who add sulfites to none of the wines they produce, people who
would like to drink wine but are allergic to sulfites can drink wines produced by
these wine makers without risking an allergic reaction to sulfites.
Which of the following is an assumption on which the argument depends?
A. These wine makers have been able to duplicate the preservative effect
produced by adding sulfites by means that do not involve adding any
potentially allergenic substances to their wine.
B. Not all forms of sulfite are equally likely to produce the allergic reactions.
C. Wine is the only beverage to which sulfites are commonly added.
D. Apart from sulfites, there are no substances commonly present in wine that
give rise to an allergic reaction.
E. Sulfites are not naturally present in the wines produced by these wine
makers in amounts large enough to produce an allergic reaction in someone
who drinks these wines.
答案是E


OG上关于B C的解释是：
B-the argument specially refers to "certain sulfites" producing allergic reactions. it is entirly compatible with certain other forms of sulfits not producing allergic reactions in anyone
C-this is irrelerant. the argument does not claim that one can avoid having an allergic reaction to sulfits from any source just by restricting one's wine consumption to those varities to which no sulfits have been added.
我不明白B C 的解释。

ccx

谢啦！

sayysong

B. Not all forms of sulfite are equally likely to produce the allergic reactions.
题目中说许多人对certain sulfites有过敏反应，B说不是所有的sulfites都产生过敏，和题干可以共存。B要成为assumption还缺少一个条件，即wine中含有的sulfites不产生过敏反应。

C. Wine is the only beverage to which sulfites are commonly added.
C说所有的饮料中只有wine才加sulfites，实际上是guarantee了除wine以外的其他饮料喝了不会有过敏反应，与题干想求证的“非人工添加防腐剂的酒商产的酒”可以喝这个命题无关。

spz316

首先请LZ明确题意：条件和结论分别是
Ｅ：不往酒里面添加 Sulfites
Ｃ：人们就不会有过敏反应
其次，LZ注意了，本体在讨论的是：在酒里面加不加Sulfites 和人们是否会过敏的问题
换线的字是关键词，缺一不可
C说的酒是唯一的添加添加剂的，讨论的范围转移，跟文章中的结论人们过不过敏没有任何关系。
B说的是并不是所有的Sulfites 都会产生过敏，文中根本就没谈具体哪种S能够导致过敏，无关。

最后，本题是假设题
GMAC给出的官方做法就是将选项取非，能够构成削弱的即为假设
BC取非后分别是
B所有的S都能让人过敏，C酒不是唯一的添加S的东西
都不能削弱文章结论
E中取非后，酒天然含有S，可以直接削弱文章结论，即会导致人们过敏。