想问几道陈向东的逻辑题 NN帮帮忙啊

夏花berry

1. Proportionally, more persons diagnosed as having the brain disorder schizophrenia were born in the winter months than at any other time of year.A recent study suggests that the cause may have been the nutrient-poor diets of some expectant mothers during the coldest months of the year, when it was hardest for people to get, or afford, a variety of fresh foods.


Which of the following, if true, helps to support the conclusion presented above?

A.Over the year the number of cases of schizophrenia has not shown a correlation with degree of economic distress.

B.Most of the development of brain areas affected in schizophrenia occurs during the last month of the mother’s pregnancy.


答案 B    A排除了它因不就是加强吗

2. A common defense of sport hunting is that it serves a vital wildlife-management function, without which countless animals would succumb to starvation and disease. This defense leads to the overly hasty conclusion that sport hunting produces a healthier population of animals.　

　　Which of the following, if true, best supports the author s claim that sport hunting does not necessarily produce a healthier population of animals?

　　A. For many economically depressed families, hunting helps keep food on the table.

　　B. Wildlife species encroach on farm crops when other food supplies become scarce.

　　C. Overpopulation of a species causes both strong and weak animals to suffer.

　　D. Sport hunters tend to pursue the biggest and healthiest animals in a population.

　　E. Many people have strong moral objections to killing a creature for any reason other than self-defense.

　　答案：(D)
     不理解为什么捕杀biggest and healthiest animals就不会产生a healthier population of animals？

　

30days

第一题的A只是排除了一个他因，而只有排除所有他因才算是加强

第二题原文中的辩解说是因为一些较弱的动物本来会死，所以他们打猎不会影响到动物数量，进而推出说打猎会使population更健康。但是D选项说他们打的都是健康的动物，这些动物是不会因为疾病什么的死去的，而那些软弱的动物自己还是要死的，所以population会减少更多就不healthy了

loverwy

我觉得第二题的意思应该是：

打猎对于动物生存是是非常必要的（因为打猎比赛可以减少动物数量），否则动物因为数量过多就会造成有些动物饿死或者病死。因此，打猎使得动物群体更加健康。

D说的是：打猎把最健康最大的动物打死了。这下好了。

不打猎的时候，群体里有最健康的，还有一些饿死/病死的。打猎了，最健康的都没了，群体里就只剩下不怎么健康的了。

夏花berry

哦 谢谢楼上二位 但第一题B还是不明白 谁能分析分析啊

夏花berry

没人解释解释第一题吗

双鱼游

第二题
本题作者的宣称在问题中就已经告诉。问题是支持宣称：运动狩猎将不会产生健康的动物数目。直接支持就可，
D.运动狩猎者倾向于追捕最大最健康的动物。（D指出你把大的健康的捕完了，剩下老弱病残，怎么能说是产生更加健康的数目呢，与结论一致，为SUPPORT）

christete

谢谢五楼，明白了