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[V&Q讨论] 逻辑单题:猴子的头发中的DNA

huyizhi31   发表于 2018-10-15 11:56:35 | 显示全部楼层 | 阅读模式 | 跳转到指定楼层
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Biologists studying wild monkeys sometimes need the genetic material DNA from a particular monkey to determine the animal's parentage. Until recently, DNA could be extracted only from blood. Collecting a blood sample required tranquilizing the donor animal. Now DNA can be extracted from hair. Monkeys shed large quantities of hair in places where they sleep. Therefore, researchers will now be able to determine the parentage of individual monkeys from DNA without tranquilizing the monkeys.+ Z7 R( e1 f  l% t
Which of the following is an assumption on which the argument depends?5 T  J5 q$ W: |' g/ P2 T. ?9 {
A The places in which monkeys sleep are easily accessible to researchers.- C- e+ m2 m4 x0 B  L& [! ]# h
B Information about a particular monkey’s parentage is the only kind of information that can be determined from DNA that has been extracted from that monkey’s hair.
' P* A& u. Q+ b5 EC For at least some samples of hair collected from monkey habitat it will be possible to associate hairs with the individual monkeys from which they came.' Q6 R1 b% Q4 ]# O# U$ P
D Examining DNA is the only way to determine the parentage of wild monkeys.8 e. B6 f- h% n. ?) V' ?' Y4 S
E It will be necessary to obtain any hair samples used in determining a monkey’s parentage from a place where the monkey has slept.8 W2 X5 c1 Z) D* ?
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答案是C,但为啥B不对呢?可以提取DNA就能决定猴子的parentage啊。0 P$ ]/ O7 [8 E4 O
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发表于 2018-10-15 11:56:35 | 显示全部楼层

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因为不是唯一的,其他选项不够严谨。试着对选项做negation test,如果否定后原文论证不成立、那选项就是必要假设不可或缺,如果否定后论证依然成立、那它不是必要条件可有可无。
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发表于 2018-10-15 12:42:17 | 显示全部楼层

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F_22 发表于 2018-10-15 12:42
8 G  {5 F! z( @( x4 R$ U因为不是唯一的,其他选项不够严谨。试着对选项做negation test,如果否定后原文论证不成立、那选项就是必 ...

: ~3 B8 W+ z1 [* _! Z' r: ^1 J有点懂你的意思,就是B可以是正确的结论。 比如吧B中的only去掉,就可以选B了吧
发表于 2018-10-15 12:49:45 | 显示全部楼层

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