prep 逻辑17题，求解，我选E，你呢？~抱拳啦~~~！！！！！

bob9603

17.(27669-!-item-!-188;#058&003302)

Urban air contains more sulfur dioxide than does rural air, and plants in cities typically grow more slowly than do plants in rural areas.In an experiment to see how much of the difference in growth is due to sulfur dioxide, classes in an urban and a rural school grew plants in greenhouses at their schools and filtered the greenhouse air to eliminate sulfur dioxide.Plants in the urban greenhouse grew more slowly than those in the rural greenhouse.

Which of the following, if true, would it be most important to take into account in evaluating the result?

(A) The urban school was located in a part of the city in which levels of sulfur dioxide in the air were usually far lower than is typical for urban areas.

(B) At both schools, the plants in the greenhouses grew much more quickly than did plants planted outdoors in plots near the greenhouses.

(C) The urban class conducting the experiment was larger than the rural class conducting the experiment.

(D) Heavy vehicular traffic such as is found in cities constantly deposits grime on greenhouse windows, reducing the amount of light that reaches the plants inside.

(E) Because of the higher levels of sulfur dioxide in the air at the urban school, the air filters for the urban school's greenhouse were changed more frequently than were those at the rural school.

bob9603

自己顶一个~

ainiAnnie

我选D，现在详细说一下自己的分析思路，觉得自己想的挺对的（因为跟我以前高中学的知识有关~）
先分析题目
Urban air contains more sulfur dioxide than does rural air, and plants in cities typically grow more slowly than do plants in rural areas.  SD含量 城市＞农村且 树木生长速度 城市＜农村，暗示 SD含量是影响树木生长的因素。
In an experiment to see how much of the difference in growth is due to sulfur dioxide, classes in an urban and a rural school grew plants in greenhouses at their schools and filtered the greenhouse air to eliminate sulfur dioxide. 很合逻辑，下面作者进行实验来验证SD在多大程度上影响了树木的生长，采用的控制变量的方法，读到这，我就想到是否排除他因，因为想要通过控制变量的方法得出准确结果（这又是一个评价题），除待检验因素其他因素必须完全相同，那么一个逻辑漏洞就是存在其他不同因素，比如空气中其他成分含量不同之类的。。。OG也经常有需要排除他因的题目。
Plants in the urban greenhouse grew more slowly than those in the rural greenhouse.这是这个实验的结果，其实根据这个结果不能说明问题，因为如果按照作者的猜想SD为主要因素的话，排除SD后两处的树木生长速度应该相同。而此处依然是 城市慢于农村。
现在要求我们来评价这个结果，正确答案里应该提供他因，即为我们需要take into account.

ainiAnnie

现在来分析选项
(A) The urban school was located in a part of the city in which levels of sulfur dioxide in the air were usually far lower than is typical for urban areas.实验已经排除了SD的影响，所以即便上述情况为真，对实验结果也没有影响，可以看成是无关选项么。。。
(B) At both schools, the plants in the greenhouses grew much more quickly than did plants planted outdoors in plots near the greenhouses.这个论述表明植物的生长速率是和SD有关的，但并没有提供其他可能。
(C) The urban class conducting the experiment was larger than the rural class conducting the experiment.无关选项。
(D) Heavy vehicular traffic such as is found in cities constantly deposits grime on greenhouse windows, reducing the amount of light that reaches the plants inside.提供了其他可能也是我们评价这个实验结果（注意实验目的）需要考虑的
(E) Because of the higher levels of sulfur dioxide in the air at the urban school, the air filters for the urban school's greenhouse were changed more frequently than were those at the rural school.无论两个学校的更换频率怎么样，都是保证SD被排除罢了，也可以归为 无关选项。

解答完毕，希望有帮助。

ainiAnnie

我又找到一个链接，也供参考
http://www.manhattangmat.com/forums/urban-air-contains-more-sulfur-dioxide-than-does-rural-air-t973.html

bob9603

太谢谢aini妹纸啦~我先看看哈~

bob9603

现在来分析选项
(A) The urban school was located in a part of the city in which levels of sulfur dioxide in the air were usually far lower than is typical for urban areas.实验已经排除了SD的影响，所以即便上述情况为真，对实验结果也没有影响，可以看成是无关选项么。。。
(B) At both schools, the plants in the greenhouses grew much more quickly than did plants planted outdoors in plots near the greenhouses.这个论述表明植物的生长速率是和SD有关的，但并没有提供其他可能。
(C) The urban class conducting the experiment was larger than the rural class conducting the experiment.无关选项。
(D) Heavy vehicular traffic such as is found in cities constantly deposits grime on greenhouse windows, reducing the amount of light that reaches the plants inside.提供了其他可能也是我们评价这个实验结果（注意实验目的）需要考虑的
(E) Because of the higher levels of sulfur dioxide in the air at the urban school, the air filters for the urban school's greenhouse were changed more frequently than were those at the rural school.无论两个学校的更换频率怎么样，都是保证SD被排除罢了，也可以归为 无关选项。

解答完毕，希望有帮助。

-- by 会员 ainiAnnie (2012/3/2 18:54:49)

哈~！annie姐的回答真是详细~！！

我基本上明白了这个意思~就是把sd的环境条件排除后，结果和以前一样，这也就是说：应该是其他原因导致这个结果的！（支持这句话就是support，反之，答案取反，就weaken了，所以就符合了evaluation题的思路了）~
是这个意思吧annie姐？

抱拳啦哈~~

ainiAnnie

现在来分析选项
(A) The urban school was located in a part of the city in which levels of sulfur dioxide in the air were usually far lower than is typical for urban areas.实验已经排除了SD的影响，所以即便上述情况为真，对实验结果也没有影响，可以看成是无关选项么。。。
(B) At both schools, the plants in the greenhouses grew much more quickly than did plants planted outdoors in plots near the greenhouses.这个论述表明植物的生长速率是和SD有关的，但并没有提供其他可能。
(C) The urban class conducting the experiment was larger than the rural class conducting the experiment.无关选项。
(D) Heavy vehicular traffic such as is found in cities constantly deposits grime on greenhouse windows, reducing the amount of light that reaches the plants inside.提供了其他可能也是我们评价这个实验结果（注意实验目的）需要考虑的
(E) Because of the higher levels of sulfur dioxide in the air at the urban school, the air filters for the urban school's greenhouse were changed more frequently than were those at the rural school.无论两个学校的更换频率怎么样，都是保证SD被排除罢了，也可以归为 无关选项。

解答完毕，希望有帮助。

-- by 会员 ainiAnnie (2012/3/2 18:54:49)

哈~！annie姐的回答真是详细~！！

我基本上明白了这个意思~就是把sd的环境条件排除后，结果和以前一样，这也就是说：应该是其他原因导致这个结果的！（支持这句话就是support，反之，答案取反，就weaken了，所以就符合了evaluation题的思路了）~
是这个意思吧annie姐？

抱拳啦哈~~

-- by 会员 bob9603 (2012/3/2 21:49:17)

你总结的很好么~由于我最近在做SC，只把OG 的逻辑过了一遍，所以你说的解题思路我还没怎么总结。。。不过你的更简洁清晰么，我就是直接分析的。马上总结逻辑的时候还多多向你请教~

bob9603

莫问题，只是我的哪个部分都不好，谈不上指教啦，你不启发我，我也想不出来，嘿嘿~