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Early in the twentieth century, Lake Konfa became very polluted. Recently fish populations have recovered as release of industrial pollutants has declined and the lake's waters have become cleaner. Fears are now being voiced that the planned construction of an oil pipeline across the lake's bottom might revive pollution and cause the fish population to decline again. However, a technology for preventing leaks is being installed. Therefore, provided this technology is effective, those fears are groundless.
The argument depends on assuming which of the following?

正确答案: B

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我觉得C超级对啊 为什么不选呢

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楼主
发表于 2010-12-20 10:36:29 | 只看该作者 回帖奖励 |正序浏览 |阅读模式
Early in the twentieth century, Lake Konfa became very polluted.  Recently fish populations have recovered as release of industrial pollutants has declined and the lake’s waters have become cleaner.  Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again.  However, a technology for preventing leaks is being installed.  Therefore, provided this technology is effective, those fears are groundless.
The argument depends on assuming which of the following?
A.    Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters.
B.    Other than the possibility of a leak, there is no realistic pollution threat posed to the lake by the pipeline’s construction.
C.    There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa.
D.    Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause.
E.    The species of fish that are present in Lake Konfa now are the same as those that were in the lake before it was affected by pollution.
C为什么不对!!??
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13#
发表于 2011-6-1 06:18:14 | 只看该作者
LS 正解学习中。解CR经常跑偏。。。
12#
发表于 2011-1-1 18:33:22 | 只看该作者
首先,答案必然是B
选项B说,建造pipeline的唯一可能的对水源的污染就是泄露。原文中说,provided this technology is effective,即唯一的由于建造pipeline所能导致的污染也可以被控制。所以逻辑成立。
GWD说,不要管到底是假设还是增强,一切正向评价均是使得原文中结论的置信度的增加。

既然有人讨论了A、C,我也说一下这两个答案
选项A说,除了与建造pipeline相关的发展以外,没有其他的污染源
确实,这也是水源不被污染的前提条件之一,但是,请注意原文讨论的内容,是Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again。说明,一切原文的讨论时围绕建造pipeline展开的,既然fears只是关于pipeline的,那么其他的建造就应被默认为没有影响(狒狒说,一定要明白原文再讨论的核心是什么,跟核心无关的统统是错误选项)
选项C说,防漏措施并不一定有效。注意原文明确提到 Therefore, provided this technology is effective, those fears are groundless.说明,结论(Therefore之后的内容)是一个有条件的结论,条件(provided)之后的内容若成立,则fears are groundless。因而,如果否认条件,是并不能否认结论的。即如果provided的内容不存在,则根本无法对结论的真实性进行判断(因为没有结论存在的前提,所以结论根本就不存在)。用狒狒的话说就是不能否认原文的内容。(说句题外话,我觉得GWD确实比狒狒技高一筹)
11#
发表于 2011-1-1 11:48:31 | 只看该作者
我觉得A是不对的,因为这个是假设题,选项应该是结论的必要条件
也就是说一定要选项成立,题中的结论才能成立

题中已经说了那个防漏技术是有效的,那么要让结论成立,也就是新建的pipeline不会造成污染,应该是要说除了漏油之外,这个pipeline没有别的污染源了,而漏油这个污染源被防漏技术解决了,所以就不会再有污染,这样子就很完整了。

所以应该是选B,A的话扯到别的industry身上去了,而题中结论句里的的“those fears”是专指对这个pipeline的担忧的,所以A是不对的
10#
发表于 2010-12-23 10:35:51 | 只看该作者
很想知道下,A 为什么不对呢?
A说除了管道建设造成的污染之外,没有其他新的污染源,这岂不是更符合题意吗?
9#
发表于 2010-12-22 17:28:14 | 只看该作者
补充一点,文章最后说了:provided this technology is effective, those fears are groundless.

也就是,原文已经说了这个防漏措施是有效的,C只是重复了原文的意思,没有能够排除他因
8#
发表于 2010-12-22 17:26:52 | 只看该作者
CB二者比,B好一些
C选项:即使排除楼上几位同学说的主观成分,实际C只能说明这种防漏措施很有效,能防漏。那么如果有其他原因呢,比如建设过程中造成的污染?明显,C无法支持,而B支持了。
7#
 楼主| 发表于 2010-12-22 16:55:01 | 只看该作者
哪位高手给个  一锤定音   的答案
6#
发表于 2010-12-20 23:02:56 | 只看该作者
嘿嘿~ 第1回得到"正解"的评价~ 呵呵 谢谢jbc啦~ 貌似咱俩用户名...

jbc同学的这个例子....好吧 意思理解了....

不过要是推翻不就更削弱了? 只是强力强力的削弱?
5#
发表于 2010-12-20 21:41:49 | 只看该作者
恩,楼上美女正解。believe是个主观词。

比如:我相信我女友爱上我了。。。这只是我个人感觉。但,也许我女友已经劈腿了。

即使这个believe不算,C也说不过去。题干已经说了provided this technology is effective。 C直接反对结论了。 这不是削弱,是推翻。
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