作者wayshawn (快乐熄灯,灯熄了,但...)
看板GMAT
标题Re: [语文] GWD-9-Q13
时间Tue Aug 25 12:13:29 2009
※ 引述《denizee3 (妮)》之铭言:
: GWD-9-Q13:
: Fact: Asthma, a bronchial condition, is much less common ailment than hay
: fever, an allergic inflammation of the nasal passages.
: Fact: over 95 percent of people who have asthma also suffer from hay fever.
: If the information given as facts above is true, which of the following must
: also be true?
Fact 1: common的程度: Asthma < Hay fever
Fact 2: 得到Asthma的人中,95%也有Hay fever
(由上述两个facts,可画出甘特图,比较好理解)
本题题型为conclusion,正确答案三要件:
1. 不可超出原题范围, 2. 不可违背原题, 3.不可加入主观意见
: A.Hay fever is a prerequisite for the development of asthma
^^^^^^^^^^^^^^^^^
违背原题,得到Asthma的人中,仍有5%没有Hay fever,所以Hay fever
不会是Asthma的的prerequisite
: B.Asthma is a prerequisite for the development of hay fever
^^^^^^^^^^^^^^^^^
违背原题,Asthma比Hay fever还不common,不可能会是Hay fever的
prerequisite
: C.Those who have neither hay fever nor asthma comprise less than 5 percent
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
超过原题范围,这题要讨论的是得病的人,没病的人未在讨论的范围
自然不可能推出结论
: of the total population
: D.The number of people who have both of these ailments is greater than the
^^^^^^^^^^^^^^^
超过原题范围的推论,有画出甘特图就知道这个选项的叙述没有必然性
: number of people who have only one of them
: E.The percentage of people suffering from hay fever who also have asthma is
: lower than 95 percent.
正确!一样从甘特图来看
画两个圆,分别代表A及H,依据Fact 1, A的圆比较小 --> A<H
依据Fact 2, A及H会相交,相交部分占A的95% --> (A&H) / A > 95%
而本选项的
"The percentage of people suffering from hay fever who also have asthma"
化成公式就是 (A&H) / H
在分子相同,惟分母较大的状况下(A<H), (A&H)/H < [(A&H) / A > 95%]
当然这个选项有一些缺陷, (A&H)/H < (>95%),跟 < 95%还是有一些差距
但比较起来,只有这个选项比较像是对的
--
实战能做对这种题的人真不简单.....
: Answer E.
: 刚有爬文不过我还是搞不懂为什麽是E?!
: 头脑转不过来 Q Q
: 是否有大大愿意帮忙推论一下?
: Thanks!
--
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◆ From: 60.245.112.92
1F:→ wayshawn:想不出来的话,我再把我画的图scan上传吧. 08/25 12:17
2F:推 denizee3:听你这样解说 完全了解了!!! 谢谢你 :) 08/25 12:43
3F:推 CocaQ:这题也有问题 谢谢佛心W 08/25 12:45