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【OG20-P602-739题】
Between 1980 and 2000 the sea otter population of the Aleutian Islands declined precipitously. There were no signs of disease or malnutrition, so there was probably an increase in the number of otters being eaten by predators. Orcas will eat otters when seals, their normal prey, are unavailable, and the Aleutian Islands seal population declined dramatically in the 1980s. Therefore, orcas were most likely the immediate cause of the otter population decline.
Which of the following, if true, most strengthens the argument?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
题型:Strengthen
原文大意:从1980年到2000年,阿留申群岛的海獭数量急剧下降。没有任何疾病或营养不良的迹象,所以被捕食者吃掉的水獭数量可能会增加。在20世纪80年代,阿留申群岛的海豹种群数量急剧下降,而在它们正常的猎物海豹的情况下,虎鲸会吃掉水獭。因此,虎鲸很可能是水獭种群数量下降的直接原因。
逻辑链:orcas吃otter,导致otter的数量下降,orcas吃otter是因为seals没有了
A.自从海獭数量减少以来,海獭的主要食物——海胆的数量就增加了。
B.海豹不吃海獭,也不与海獭争夺食物。
C.大多数幸存的海獭生活在一个无法进入奥卡斯的海湾。大部分幸存otter生活在orcas到不了的海湾;说明orcas能到的地方otter都被吃了,搭桥增强,正确
D.自20世纪80年代以来,阿留申群岛的虎鲸数量一直在下降。
E.上世纪80年代,阿留申群岛附近的商业捕鱼量增加,导致海豹食用的鱼类数量略有下降。
275476gao
老鼠吃猫也吃鱼,当猫找不到鱼吃的时候,同时老鼠的数量下降,那么就一定是猫吃了。 这是因为——大多数活着的老鼠都藏在猫找不到的洞里 A选项翻译一下:自从老鼠的数量减少,粮仓里的稻谷增多了,平时老鼠吃这些粮食(跟逻辑推理无关) B:鱼不吃老鼠,同时也不与老鼠竞争食物(跟逻辑推理无关) 不要管扯不扯,记住要跟题目的逻辑紧扣起来,尝试理一下思路,感觉GMAT难题就是神脑洞 另外那个Most of surviving是指活着的大多数,原来100只老鼠,猫逮了80只,活了20只,有15只都躲在猫找不到的洞里
Crystal8
“无因无果”加强论证
冲他丫的
关系链 0r-otter
我必700
那不正说明了,海豹不是导致OT下降的原因,OC才是么。。
285452zdsb
从1980年到2000年,阿留申群岛的海獭数量急剧下降。没有任何疾病或营养不良的迹象,所以被捕食者吃掉的水獭数量可能会增加。在20世纪80年代,阿留申群岛的海豹种群数量急剧下降,而在它们正常的猎物海豹的情况下,虎鲸会吃掉水獭。因此,虎鲸很可能是水獭种群数量下降的直接原因。
Which of the following, if true, most strengthens the argument?
下列哪一个,如果是真的,最能加强论点?
A.
自从海獭数量减少以来,海獭的主要食物——海胆的数量就增加了。
B.
海豹不吃海獭,也不与海獭争夺食物。
C.
大多数幸存的海獭生活在一个无法进入奥卡斯的海湾。
大部分幸存otter生活在orcas到不了的海湾;说明orcas能到的地方otter都被吃了,搭桥增强,正确
D.
自20世纪80年代以来,阿留申群岛的虎鲸数量一直在下降。
E.
上世纪80年代,阿留申群岛附近的商业捕鱼量增加,导致海豹食用的鱼类数量略有下降。
498029igts
现象解释,加强,反因反果 核心:orcas吃otter,导致otter的数量下降,orcas吃otter是因为seals没有了 A:没有讨论orcas吃otter B:不竞争,按理来讲otter数量上升 C:反因反果,住在没有orcas的otter活了,说明有orcas的otter死了,说明orcas吃otter D:没有讨论orcas吃otter E:没有讨论orcas吃otter
杀鸡迫在眉睫
我当是选择E是因为:商业捕捞↑——鱼的数量↓,而海豹吃鱼、Orcas吃海豹,鱼的数量↓——海豹↓——Orcas改吃otters——Otters数量↓。这不挺说得通嘛!逻辑链是对的,是不是就是错在了slight decline?我看了OG的解释,才知道:因为鱼的数量↓,则海豹的数量和Otters的数量都会受影响,而原题干排除了Otters出现malnutrition的情况,所以E选项这种会导致otters出现malnutrition情况的理由就不能作为增强的选项……天哪!太Tricky了!晕……
700+就好回复 1374109sujb
感觉怎么说都是削弱呀,加强是咋想的?人工铺鱼导致海獭(otters)食物数量下降进而可能导致海獭数量下降,这也是他因削弱,削弱了原文说是虎鲸(Ocras)捕食海獭的关系
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2021-03-14 15:44:32
700+就好回复 700+就好
哎呀,我看错了,E选项说的是海豹数量,那就更容易想了,原文都已经说了海豹数量也急剧下降了,此时再讨论海豹已经没有意义了
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2021-03-14 15:53:22
242097vx
这么隐蔽是为了这折磨谁
Mariposa爱学习
没注意到surviving。。。大部分幸存的otter生活在orcas无法到达的海域,说明orcas把otter吃的只剩这么一点了 E选项 无法作为最优答案,因为fish数量要么就多下降一点,你这slight decline无法解释为什么otter陡然下降
GMAT的大师兄
在1980-2000年之间在A岛的水濑数量急剧减少。没有任何疾病或者营养不良的征兆,所以可能是因为水濑天敌数量的增加而导致的。当没有海豹时,虎琼会吃水濑 ,并且A岛海豹的数量从1980年开始陡然下降。因此水濑的下降一定与虎琼有直接关系。 A. 无关选项 - 水濑的主要食物urchins的数量在水濑数量下降后上升了 B. 海豹不吃水濑,并且不与水濑抢食物。 C. 大部分生存下来的水濑生存在一个虎琼接触不到的地方 – 说明水濑的减少与虎琼有直接关系,增强了文章结论 D.在A岛虎琼的数量自1980年来开始下降 E. 1980年在A岛附近的商业捕鱼导致了鱼(海豹猎物)的减少
ALLAN FERRARA
相信很多同学选了B,那么B是怎么样错的呢?我以为:B 是增强了这以一点:seals的存在会使得Ocars减少食杀otters,但无法进一步的增强文章的主要结论,即Ocars是otters减少的元凶。换句话说,seals的减少和ocars增多食杀otters是相关关系,而B选项增强了这一关系,却并没有进一步增强文章的主结论。而C选项则直接地针对Ocars来谈,增强了ocars和otters减少的关系。
emily666
越做越崩溃。。
Sasa_ly98
我太难了
700加我来辣
otter数量↓,orcas吃otter,ocars也吃seal,seal数量↓→o吃了a gap排除他因 E只是slight不能导致declined precipitously;C加强了o能吃到a的因果
vivice
真的想知道要怎么在一分半钟之内做到 读完题 理清逻辑链 进行推理 排除选项的。。。
1027663jqan回复 vivice
读完题+理清逻辑+读完选项+排除选项思考 一分半。。。
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2022-07-17 18:13:45
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