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21. Historian: We can learn about the medical history of individuals through chemical analysis of their hair. It is likely, for example, that Isaac Newton’s psychological problems were due to mercury poisoning; traces of mercury were found in his hair. Analysis is now being done on a lock of Beethoven’s hair. Although no convincing argument has shown that Beethoven ever had a venereal disease, some people hypothesize that venereal disease caused his deafness. Since mercury was commonly ingested in Beethoven’s time to treat venereal disease, if researchers find a trace of mercury in his hair, we can conclude that this hypothesis is correct.

Which one of the following is an assumption on which the historian’s argument depends?

A.        None of the mercury introduced into the body can be eliminated.

B.        Some people in Beethoven’s time did not ingest mercury.

C.        Mercury is an effective treatment for venereal disease.

D.       Mercury poisoning can cause deafness in people with venereal disease.

E.        Beethoven suffered from psychological problems of the same severity as Newton’s.

想不通为什么选B？

23. On a certain day, nine scheduled flights on Swift Airlines were canceled. Ordinarily, a cancellation is due to mechanical problems with the airplane scheduled for a certain flight. However, since it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day, some of the nine cancellations were probably due to something else.

The argument depends on which one of the following assumptions?

A.        More than one or two airplanes were scheduled for the nine canceled flights.

B.        Swift Airlines has fewer mechanical problems than do other airlines of the same size.

C.        Each of the canceled flights would have been longer than the average flight on Swift Airlines.

D.       Swift Airlines had never before canceled more than one or two scheduled flights on a single day.

E.        All of the airplanes scheduled for the canceled flights are based at the same airport.

这个不明白为什么选A。

感觉LSAT的题目题干看着还行，但是答案都不好想。

21题

not+weaken

对B取非

如果大家都用水银的话，那么推理就有问题了

23题

对airplane和flights的理解

airplane飞机

flight航班

文章说：一个航班不会有多于1到2次的机械故障，所以有其它问题。得出这样的结论是的基础就是，不同的flights有不同飞机负责。如果是一个飞机负责N个航班，则飞机出现机械故障就会影响filghts，这样结论就是的确是机械故障，这与文章的结论相反了。

21题还是不明白，麻烦斑竹再讲讲。

23题似懂非懂。

lsat题里面的逻辑关系好像没有GMAT清晰阿？