求教GMAT逻辑大全Test19-7

adasuying2004 · 发表于 2010-9-8 11:53:50

大全-19-7. The human body secretes more pain-blocking hormones late at night than during the day. Consequently, surgical patients operated on at night need less anesthesia. Since larger amounts of anesthesia pose greater risks for patients, the risks of surgery could be reduced if operations routinely took place at night.
Which of the following, if true, argues most strongly against the view that surgical risks could be reduced by scheduling operations at night?
(A) Energy costs in hospitals are generally lower at night than they are during the day.
(B) More babies are born between midnight and seven o’clock in the morning than at any other time.
(C) Over the course of a year, people’s biological rhythms shift slightly in response to changes in the amounts of daylight to which the people are exposed.
(D) Nurses and medical technicians are generally paid more per hour when they work during the night than when they work during the day.
(E) Manual dexterity and mental alertness are lower in the late night than they are during the day, even in people accustomed to working at night.

答案是E，但是我觉得是无关选项。我本人选C。

bdsjb116 · 发表于 2010-9-8 20:08:52

题目问的是argue most strongly against 的对象是‘ surgical risks could be reduced by scheduling operations at night“ 因此需要找到surgical risks和night的关系的选项

此类题目中若是引入了无关的概念如energe cost, babies, nurse and medical之类的就可以先排除剩下C和E

C:一年之间，人体的生物节律随着被暴露的日照量变化而轻微变化。咋一看看貌似说明了夜晚会影响生物节律，仔细看发现生物节律也是一个无关选项，就算是有变化，也无法证明surgical risks和夜晚的关系。若正确，必须要继续说明生物节律于surgical risks之间的因果关系。并且若是注意”slightly“便可以快速排除，因为轻微的变化可以忽略不计，对结论没有负面效应。

andreasyang · 发表于 2010-9-8 21:36:39

C才是无关，E那么明显的

求教GMAT逻辑大全Test19-7

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