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标题: 求助PREP1-27 BF题~~感谢回答!~ [打印本页]

作者: 水色青空    时间: 2010-4-20 20:26
标题: 求助PREP1-27 BF题~~感谢回答!~
27.(31231-!-item-!-188;#058&004411)



Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage.Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones.Thus, for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer.However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is likely to become widespread.



In the argument given, the two portions in boldface play which of the following roles?



(A) The first supplies a context for the argument; the second is the argument's main conclusion.

(B) The first introduces a development that the argument predicts will have a certain outcome; the second is a state of affairs that the argument denies will be part of that outcome.

(C) The first presents a development that the argument predicts will have a certain outcome; the second acknowledges a consideration that weighs against that prediction.

(D) The first provides evidence to support a prediction that the argument seeks to defend; the second is that prediction.

(E) The first and the second each provide evidence to support the argument's main conclusion.












额,一开始就选了A,觉得那个CONTEXT很合适,但是答案是C~~不知道该怎么解释?希望NN帮帮忙~~谢谢了!

作者: keerbaobei    时间: 2010-4-20 20:38
顶~~~好久没看过g,已经完全忘记了……姐姐,你这么早又复习了?呵呵,加油!!!
作者: ellie78    时间: 2010-4-20 20:45
一不小心蒙对了...不是牛人,但是也讲一下鄙人的思路,楼主凑合听哈~

段落结构是这样的:先说此物的缺点,后面再讲因为其他方面的因素,还是要肯定它。前BF讲缺点,后BF讲优点。后面是main conclusion.前BF将小非,后BF讲大是。

到这里先把DE排除了。D一出现prediction我就觉得不用看内容了,E用and连接1st和2nd,将两者共性,看着结构就知道后面说不出正确的话。甭看了。

A说前BF是context,不对,context一般是讲语境,铺垫主观点,所以态度上应该跟观点站在一条战线,一是一非肯定不行

B说后BF否定了前BF的部分outcome--不对,后者提的是比前者更大局的“是”,而没有在“非”的基础上再次否定

所以,C

盼真正大牛拍砖~

---又重新编辑了一下,按照C解释的,错写成了B,汗...
作者: catherine66    时间: 2010-4-21 19:16
我也选的A
作者: lovepiao    时间: 2010-4-21 20:47
第二句黑体字开头有However。所以第一句为文章反对的观点,第二句为文章的结论
A: The first supplies a context for the argument错,应该是文章反对的
B:说反了
C: weighs against正好说明了反对,对应了however
D: The first provides evidence to support a prediction that the argument seeks to defend错,应该是文章反对的,而不是defend
E:错。同理,第一句是文章反对的观点,而第二句是文章的main conclusion,而不是evidence to support the argument's main conclusion
作者: aomeisoft7    时间: 2010-9-16 16:32
第二句黑体字开头有However。所以第一句为文章反对的观点,第二句为文章的结论
A: The first supplies a context for the argument错,应该是文章反对的
B:说反了
C: weighs against正好说明了反对,对应了however
D: The first provides evidence to support a prediction that the argument seeks to defend错,应该是文章反对的,而不是defend
E:错。同理,第一句是文章反对的观点,而第二句是文章的main conclusion,而不是evidence to support the argument's main conclusion
-- by 会员 lovepiao (2010/4/21 20:47:45)



我对A的分析有看法
B1说是施肥和浇水会要更多的成本,作者并没有反对这一点,B2说,因为消费者需求会增长(其言下之意是,施肥和浇水的成本是比原来多,但是需求增长带来的利益会弥补这一成本使农民受益),所以还是要种。
B2中however反对的是thus后面的观点(即农民不会去种),而不是反对的B1中说到的施肥和浇水成本高的观点。
求高人解答!!
作者: mongmong    时间: 2012-5-27 14:20
ls所言极是,C选项里weigh against恰好说明了优势劣势的比较
作者: GMAT008    时间: 2013-12-22 22:22
还有人讨论吗?疑惑ing,今天做到了此题,说说我的推理,请大牛帮着分析一下:

题意:
1. PS研发了GE的S可以抗虫但是贵,而且还需要更多的FW才能长得好-->农夫种GE的S不省钱-->所以很难推广开;
2. 因为有特殊人群保证了GE的S的需求,所以S还是很可能普及开的。

BF1是第一层结论的论据,但可以说引起了整个论证;
BF2则是直接反对了第一层结论并给出了主结论。

所以我到现在还是觉得A有合理性。






作者: Ericli9    时间: 2014-5-9 13:31
这个问题我一开始也选了A,后来参考**上的讨论以及manhattan上Ron的解释,觉得还是C更好。
GMAT中的context只是作为背景信息,不直接参与到argument的前提->结论的推理过程当中。这样的话,A的前半句是不对的,排除掉。
整段的结构如下:
Plant scientists have used genetic engineering on seeds to produce crop plants that are highly resistant to insect damage. (Context)
Unfortunately, the seeds themselves are quite expensive, and the plants require more fertilizer and water to grow well than normal ones. (Fact 1 to support prediction 1)
Thus, for most farmers the savings on pesticides would not compensate for the higher seed costs and the cost of additional fertilizer. (Prediction 1)
However, since consumer demand for grains, fruits, and vegetables grown without the use of pesticides continues to rise, the use of genetically engineered seeds of this kind is likely to become widespread. (Fact 2 to support Prediction 2 -> Main conclusion)
作者: 奥兰多铁杆球迷    时间: 2017-10-25 17:20
我也选了A,但后来看了下答案的解释,仿佛C更合理。尤其是那个however = weigh against
作者: 绿杨小庙    时间: 2018-8-3 12:41
分享自己的思考——
关于A\C之间纠结:
当时不选C的原因是觉得C的前半句有点问题,但觉得C的后半句还是对的。

现在重新理一下C的前半句The first presents (that) a development (that the argument predicts)
will have a certain outcome 尽管在考语法的时候,严格上讲,宾语从句要加that,否则会造成歧义,但是这里没有加that,可能考官就是故意想给题目增加难度。所以C的前半句的意思是——前一个黑体展示了:一种科技发展有一种结果。尽管这里that the argument predict还是有点说不通,不能说这是argument预测的发展,但是中心词组成的句子的意思是正确的,与第一个黑体的内容确实保持一致——文中先介绍了一种基因工程,然后就讲了这种科技可能的后果就是种子贵且需要更多肥料。

当时觉得有问题是这样读的The first presents a development( that the argument predicts will have a certain outcome),这样读显然与第一个黑体的作用不一致,而且驴头不对马嘴,一下子就删掉它了但是需要注意的是predict只能做动词,显然后面一整个的定语从句有两个谓语,所以是不对的。


再来理一下A,A中的第一句话The first supplies a context for the argument,好像确实是没有问题的,第一个黑体就是展示了一种情景,一种背景,不能说它是完全错误的。但是第二句话the second is the argument's main conclusion,其实不能完全说第二个黑体是argument的结论,因为其实它实际上是一个小的argument——因为需求大,所以可能会广泛传播。如果说一个句子是一个结论,必然要有支撑它的premise,但是就上下文来看,并没有任何premise来support这个结论。

这道题题型我们要好好看题,并且黑体这种题不仅仅要看黑体部分,还一定要跟其余部分相联系。





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