急问：OG-13、OG-62、OG-67

13、Defense Department analysts worry that the ability of the United States to wage a prolonged war would be seriously endangered if the machine-tool manufacturing base shrinks further. Before the Defense Department publicly connected this security issue with the import quota issue, however, the machine-tool industry raised the national security isue in its petition for import quotas.

Which of the following, if true, contributes most to an explanation of the machine-tool industry's raising the issue above regarding national security?

B) The Defense Department is only marginally concerned with the effects of foreigh competition on the machine-tool industry.

为什么不选这一项？既然是＂国防部不太关心外国竞争带来的负面影响＂，就说明必须提出国家安全问题才能引起国防部重视呀！OG的解释是 it" merely explain why the industry might not raise the security issue", 什么意思？

62、At a recent conference on environmental threats to the North Sea, most participating countries favored uniform controls on the qulity of effluents, whether or not specific environmental damage could be attributed to a particular source of effluent. What must, of course, be shown, in order to avoid excessively restrictive controls, is that----------

D) all of any given pollutant that is to be controlled actually reaches the North Sea at present

为什么不选？OG解释是 "Not all of any given pollutant need reach the North Sea, as choice D claims, since at most some needs to. " 又是不明白．

67、A greater number of newspapers are sold in Town S than in Town T. Therefore, the citizens of Town S are better informed about major world events than are the citizens of Town T.

Each of the following, if true, weakens the conclusion above EXCEPT:

D) a weekly newspaper restricted to the coverage of local events is published in town S.

OG不选这项的原因是：" choice D suggests that much newspaper reading in S is not a source of information about world events." 我觉得很不服气，选项只说，＂S镇有一家周报是只关注当地新闻的＂，由此怎可以说＂当地大部分报纸不提供世界新闻＂呢？万一还有９９家报纸只关注世界新闻怎么办？

以上题都是我做错以后白思不得其解的，烦请各位点拨，感激不尽！！

13，题目说DD担心如果machine tool的生产收缩的话，US打持久战会非常不利。然后，machine tool industry在申请输入限额时就提到了国家安全问题。此处的弦外之音是既然DD关心国家安全问题，那么这些industry就以此为把柄来达到他们申请输入限额的目的，正所谓投其所好。而B说DD并不太关心这些industry与国外竞争的负面影响，那么industry就不可能以此为把柄了。况且B有些out of scope。

62，题干说这个control要通过限制污水排放来保护环境。D说所限制的污染物必须是reaches the North Sea at present，那么仅仅只限制目前在流经NS的污染物就能达到保护环境了吗？如果有些污染物虽然现在没有流经，说不定以后就会呢。那么正如OG所说，目前限制的并不是所有都要流经NS，至少有些是。

67，题干仅仅通过S市卖的报纸的数量较多就得出S市民更了解世界时事，D则从一个侧面说了数量并不等于质量，属于一定程度的削弱。JaneWei做OG真的很认真，我一开始都没有留意到这一点，不过我觉得你所说的是依赖于另外一个假设，而这个假设题目并没有提供，算是你想的有点out of scope了。如果真是很不服气，那用排除法，也还是可以选出E的。

以上是我的拙见，请指教！

谢谢arundhati那么快就答复我！！！

只是我还是有一点不懂，１３题我也同意arundhati的观点，即认为B暗示industry 不可能以外国的竞争为把柄．但那不是恰巧证明了industry必须以国家安全为把柄吗？

另外，对于OG对这一选项的解释该怎么理解呢？

JaneWei 的认真实在让我佩服！

你说的industry不能以外界竞争为把柄，则一定以国家安全为把柄吗？你依旧是依赖了另一个assumption，这个assumption题干也没有给出。也就是说，industry也许还有替他很多把柄啊，为什么单单选用国家安全呢？ 况且，B说DD不太关心industry的国外竞争带来的负面影响，言下之意就是DD不关心这个industry，那么industry还能有什么把柄？

OG的解释也正是我上一帖所说的：这个理由并不是industry以国家安全为借口而达到自己目的的理由，而是他不以这个为借口的理由。

不知这样说明不明白？请指教！

啊，这下明白了．．．恍然大悟！！！再谢一次arundhati ！