再问两道GWD上的逻辑题 ~~

catherinexin · 发表于 2009-11-1 19:04:15

请教两道GWD上的逻辑题, 请NN帮忙分析下~~

Which of the following most logically completes the argument?
A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants. Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert.

ossibly, therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.
A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers
B. the herb’s high level of histidine production is found to be associated with an unusually low level of production of other amino acids
C. others of the closely related group of plants are also found to produce histidine in large quantities
D. cultivation of the herb in soil with high concentrations of the metals will, over an extended period, make the soil suitable for plants to which the metals are toxic
E. the concentration of histidine in the growing herb declines as the plant approaches maturity

In Patton City, days are categorized as having heavy rainfall (more than two inches), moderate rainfall (more than one inch, but no more than two inches), light rainfall (at least a trace, but no more than one inch), or no rainfall. In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rainfall for the year was 20 percent higher in 1990 than in 1910.
If the statements above are true, then it is also possible that in Patton City
A. the number of days with heavy rainfall was lower in 1990 than in 1910
B. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910
C. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910
D. the total number of inches of rain that fell on days with moderate rainfall in 1990 was more than twice what it had been in 1910
E. the average amount of rainfall per month was lower in 1990 than in 1910

第一题第一次做选C,然后看答案是E, 后来终于说服自己选E, 结果第二次做答案给的又是C, 不过个人还是倾向与E, 可否请NN帮忙确定下答案呢?
第二题做是做对了, 可就不是非常清楚其他选项为什么错, 而且也不能保证第二次会对...所以可不可以帮忙分析下呢? 万分感谢!!

ARCHER420 · 发表于 2009-11-1 19:18:36

第一题我选C。E不搭。
第二题我选D。这是一个可能，其实第一反应是heavy rainfall days in 1990 more than those in 1910。但是没有这个选择。只好考虑moderate, light那个区间值都高于1910年的

melodyflying · 发表于 2009-11-1 19:35:07

第一题我选C
og上曾经说过一个方法是想support这个结论
你就设想反对这个结论的人会怎么反驳
对于这题想反对的人可能会说那为什么同样thrive in soil with high concentrations of metals 的others of the closely related group of plants 没有发现 high histidine production 呢？如果结论是对的那么others也应该发现啊
所以提供一个条件C 可以封住反对者的一个反驳观点从而起到support的作用

melodyflying · 发表于 2009-11-1 19:50:51

第二题我选D
这道题结论要成立符合commonsense的情况应该是1900的heavy rainfall比1910多而no rainfall要少
只有这样得出那个结论才算是合理虽然number和实际的amount还是有单位次数雨量的影响
A B C错误是在于他们都表示1990的no rainfall比1910高 heavy rainfall 比1910更少这个实在跟结论相悖
E完全和结论相反题设都说了1900的rainfall更多了
D是最靠谱的是结论的得出增加了合理性
其实做题目还有一个技巧仔细看本质其实ABC错的是同一个方向的可以同时排除

catherinexin · 发表于 2009-11-1 20:22:57

第一题E也可以接受的啊, 题干中说the herb’s high histidine production is what allows it to grow in metal-rich soils. 那如果反过来想, 如果herb成熟了就是不再长了, 它的histidine就会下降也可以解释啊...
第二题的答案是A额....

melodyflying · 发表于 2009-11-1 20:29:40

那我就不会了
坐等高人

ARCHER420 · 发表于 2009-11-1 20:33:07

第一题E 中GROW你最好不要单独理解成长，他是存活，生长的意思。growing old 这个说法你听说过吧。英文的思维是衰老也是grow的一部分。

第二题a选择肯定是错的，正好反了。
gwd不都是网上当下来的么，以讹传讹的事情多了，你不能迷信所谓的答案。

melodyflying · 发表于 2009-11-1 20:51:16

想了一下
BC所说the number of days with some rainfall, but no more than two inches=number of（light rainfall day+moderate rainfall day）
题设明确说了括号里的部分是1900<1910
所以B C的等于或者大于就错误
E 题设说总量1900比1910多一个月的天数是一样的
所以他们各自的 the average amount of rainfall per month 也应该是跟总量的大小想一致的
即1900比1910多
D 数学问题total number of inches=天数×每天下的单位inches数
题设说天数（1900）<天数(1910)
每天下的单位inches数变化范围是1<X=<2
用数学知识即使是二者天数一样一个取1一个取2的时候
都不能做到 in 1990 was more than twice what it had been in 1910
更何况1990的天数还比1910少 1还是取不到的单位inches
所以二者之间的差距在2倍以内

melodyflying · 发表于 2009-11-1 20:55:35

对于A
我觉得可以这么理解虽然1900年不管是 heavy rainfall 还是moderate rainfall light rainfall
论下雨次数是比1910年少
但这并不意味着总量会少
因为总量还会受每次降雨量的影响
可以是1900年heavyrain每次降雨量是1910年的好几倍
那这样即使次数少几次
但总量还是多很多的

catherinexin · 发表于 2009-11-1 21:00:13

恩, 我认同楼上的说法, 这样就清楚了, 辛苦了哈~~十分感谢~~

再问两道GWD上的逻辑题 ~~

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