Which of the following is an assumption on which the argument depends? A. Thesewinemakershavebeenabletoduplicatethepreservativeeffectproducedbyaddingsulfitesby meansthatdonotinvolveaddinganypotentiallyallergenicsubstancestotheirwine.
B. Notallformsofsulfiteareequallylikelytoproducetheallergicreaction.
C. Wineistheonlybeveragetowhichsulfitesarecommonlyadded.
D .Apartfromsulfites,therearenosubstancescommonlypresentinwinethatgiverisetoanallergicreaction.
E. Sulfitesarenotnaturallypresentinthewinesproducedbythesewinemakersinamountslargeenoughtoproduceanallergicreactioninsomeonewhodrinksthesewines. 作者: sdcar2010 时间: 2010-12-7 22:07
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 duplicatethe 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
The answer is E. Since the question is about a necessary assumption, use the negation method. If you negate E, then sulfites ARE naturally present in the wines in large enought amount to cause allergic reaction. If this is true, those wine without added preservatives are also problematic. Then the argument that allergic people can avoid sulfites by choosing wines without preservatives will not hold.作者: jiejiexi 时间: 2010-12-7 22:43
谢谢 那为什么b不对呢作者: sdcar2010 时间: 2010-12-8 01:29
Because if you negate B, the argument still holds.作者: jiejiexi 时间: 2010-12-11 17:47
why? i still can't understand.作者: dwane1113 时间: 2010-12-11 23:55
sdcar2010 说的很对！situation：由于很多人对于certain sulfites过敏，即使是添加作为防腐剂。结论是只要不在任何一种wine中加sulfites,就不会过敏。E保证了本身的sulfites不会导致过敏。所以结论成立。对于这种题叫不准就对选项进行取非，很好用。对b取非不影响答案。这是OG上的84题啊作者: jiejiexi 时间: 2010-12-12 17:41
非常的感谢 懂了