请教LSAT,test4,SectI,9,21

greenfloyd

9. It is not known whether bovine spongiform encephalopathy (BSE), a disease of cattle invariably deadly to them, can be transmitted directly from one infected animal to another at all stages of the infection. If it can be, there is now a reservoir of infected cattle incubating the disease. There are no diagnostic tests to identify infected animals before the animals show overt symptoms. Therefore, if such direct transmission occurs, the disease cannot be eradicated by ____
Which one of the following best completes the argument?
(A) removing from the herd and destroying any diseased animal as soon as it shows the typical symptoms of advanced BSE
(B) developing a drug that kills the agent that cause BSE, and then treating with that drug all cattle that might have the disease
(C) destroying all cattle in areas where BSE occurs and raising cattle only in areas to which BSE is known not to have spread
(D) developing a vaccine that confers lifelong immunity against BSE and giving it to all cattle, destroying in due course all those animals for which the vaccine protection came too late
(E) developing a diagnostic test that does identify any infected animal and destroying all animals found to be infected

答案选A，我选的是C。我认为既然显示typical symptoms, 那么病应该可以被诊断出来从而把受感染的牛移走，因此A的方法是可行的。题目中提到可以从overt symptoms给牛作出得病诊断，如果typical symtoms 不是overt symptoms, 那么怎么知道是典型症状？
而C，不可能确切知道哪个地方没有这种病（至少在受感染的牛没有显示外部病证前无法判断）， 所以C的方法不可行。

以上是我的理解，是不是理解错了，请大家指点一二。

21. Whenever a major political scandal erupts before an election and voters blame the scandal on all parties about equally, virtually all incumbents, from whatever party, seeking reelection are returned to office. However, when voters blame such a scandal on only one party, incumbents from that party are likely to be defeated by challengers from other parties. The proportion of incumbents who seek reelection is high and remarkably constant from election to election.
If the voters' reactions are guided by a principle, which one of the following principles would best account for the contrast in reactions described above?
(A) Whenever one incumbent is responsible for one major political scandal and another incumbent is responsible for another, the consequences for the two incumbents should be the same.
(B) When a major political scandal is blamed on incumbents from all parties, that judgment is more accurate than any judgment that incumbents from only on party are to blame.
(C) Incumbents who are rightly blamed for a major political scandal should not seek reelection, but if they do, they should not be returned to office.
(D) Major political scandals can practically always be blamed on incumbents, but whether those incumbents should be voted out of office depends on who their challengers are.
(E) When major political scandals are less the responsibility of individual incumbents than of the parties to which they belong, whatever party was responsible must be penalized when possible.

答案选E，不明白为什麽。我选的是A。谢谢赐教！

[em27][em04]

tongxun

9、其实你的解释差不多就将正确的解释清楚了，就差最后一步。
题目：感染了并能传染的是不一定表现出症状的，因为传染性可在任何的病程中。因此，只杀有症状的牛是没有用的。

21、the same在都blame的时候才the same。而且只是blame the party，而对人，题目中并没有说明。
E 其实是整个题目的总结语：party 是主要问题，party 就要be blamed。

greenfloyd

谢谢tongxun!
21题在我做的时侯B,E选项是被最先排除的，因为选项中出现比较，而比较的内容和结果是题干中没有出现的信息：B，MORE ACCUTATE；E LESS RESPONSIBILITY。 是不是做题时碰到题干没给出的信息不能直接排除，要子子细细部理解一遍才选？可是这样时间不够啊，tongxun, 你能不能告诉我一些基本的解题规则？

tongxun

其实，提干中是有E中比较的意思的。
on all parties about equally =>incumbents returned to office
on only one party =>incumbents from that party are likely to be defeated
这里的东西比较主要的是:equally\likely to
其中likely to =~~when possible

我做逻辑是农民出身,全是通过大量做题,做出的感觉.当然,阅读+理解的能力也是必要的.