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做了这么久的CR, 第一次碰到一个彻底想不明白的题。HELP!!!

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楼主
发表于 2010-1-19 17:13:16 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
In the vast majority of cases, when people are stopped by airport security clearance, it is because they are carrying small bits of metal, such as coins, that cannot be used as weapons, but are large enough to be picked up by highly sensitive metal detectors. Since virtually everyone carries such pieces of metal, and the weapons that are smuggled onto planes are often not made of metal, highly sensitive metal detectors have outlived their usefulness. Lowering the sensitivity of these metal detectors so that they only detect large pieces of metal would reduce the frequency with which innocent passengers are stopped without hampering security’s ability to screen for weapons.

Which of the following, if true, is most useful to support the claim that this proposal would have its desired effect if it were carried out?

(A) Airport metal detectors, when set to higher levels of sensitivity, will not react to wristwatches, belt buckles, or the small rivets commonly used on travelers’ jeans.

(B) The maintenance and electricity costs associated with metal detectors are far lower when detectors are utilized at a high level of sensitivity than when they are used at a lower level of sensitivity.

(C) A metal detector with a low level of sensitivity can provide more information about what type of weapon a person is carrying, if they are carrying a weapon, than can a metal detector with a high level of sensitivity.

(D) In some cases, passengers who are stopped because they are only carrying coins are found to be smuggling non-metal weapons.

(E) Some weapons that are not made primarily out of metal include small bits of metal used as fasteners or serial number plates.
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沙发
发表于 2010-1-19 18:02:26 | 只看该作者
觉得选项有点问题,lower, higher 写反了? 选A?
板凳
 楼主| 发表于 2010-1-19 20:10:29 | 只看该作者
我也感觉是写反了啊,可是题的确就是这样的。官方答案确实是A。可是如果题目没错,我实在是看不懂为什么选A……
地板
发表于 2010-1-19 20:34:27 | 只看该作者
不管它反没反,只有A是支持的。只要这点确定,就OK了。如果这是练习题,就更不必纠结了。
5#
发表于 2010-1-19 20:50:59 | 只看该作者

其实lower还是 higher都不影响选A

本题目关键是要弄清楚Proposal是什么?= its desired effect 。很显然是only detect large pieces of metal would reduce the frequency with which innocent passengers。。。

也就是说 不管是HIGH LEVE 还是LOW LEVEL,只要对Proposal内容SUPPORT就OK。问题是你陷入了A项给的一个假设:when set to higher levels of sensitivity。
我也学习了,呵呵!
6#
 楼主| 发表于 2010-1-19 20:54:01 | 只看该作者
这题我最后犹豫了半天最终选得C。


能麻烦讲解一下吗?如果题目没问题的话,C至少可以说明,降低sensitive不会hamper security’s ability to screen for weapons.  这个选项相比其它不是更能support这个proposal吗?
7#
 楼主| 发表于 2010-1-19 20:55:40 | 只看该作者
谢谢!似乎明白了一些了……  那么C选项为什么错呢?
8#
发表于 2010-1-19 21:25:50 | 只看该作者
C 是个无关项。第一,没说清和innocent passengers 的关联;第二,拿weapon说事,但题目说的是 metal.
9#
发表于 2010-1-19 22:55:01 | 只看该作者
C是错,不过为什么A正确。。。我觉得A这里是削弱啊
10#
发表于 2010-1-20 06:45:50 | 只看该作者
区别highly和higher(而不是Highest),a选项是指把highly降低成higher levels。
C中的其他Info与原题是否鉴别无关。
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