GWD-TN-12 求助！实在是想不通 啊，看了CD的帖子，没有讲E为什么正确的
The milk of many mammals contains cannabinoids, substances that areknown to stimulate certain receptors in the brain. To investigate the functionof cannabinoids, researchers injected newborn mice with a chemical that isknown to block cannabinoides from reaching their receptors in the brain. Theinjected mice showed far less interest in feeding than normal newborn mice do.Therefore, cannabinoids probably function to stimulate the appetite. Which of the following is an assumption on which the argument depends? A. Newborn mice do notnormally ingest any substance other than their mothers’ milk. B. Cannabinoids are the onlysubstances in mammals’ milk that stimulate the appetite. C. The mothers of newbornmice do not normally make any effort to encourage their babies to feed. D. The milk of mammals wouldbe less nutritious if it did not contain cannabinoids. E. The chemical that blockscannabinoids from stimulating their brain receptors does not independentlyinhibit the appetite.
我选的B，答案是E
感觉大家讨论的比较有争议啊，大伙再看看？
manhattan里面说B有only，极端词，一般不对。我觉得吧，在逻辑题里，这种规则应该不适用，逻辑有时候本来就是那种有点牛角尖的
其实我就是想问：E为什么对，和这题目有关系吗？！
我的理解：
前提：ca这个东西能刺激大脑的一些接受器； 为调查ca的功能，研究者注射一种化学物质到老鼠体内，这种化学物质会阻碍ca到达大脑接受器。
注射后的老鼠食欲降低。
结论：ca 的功能是刺激食欲
问假设？
B：取非。如果ca不是唯一的物质刺激食欲，就说明有其他的物质刺激，能削弱结论
E：做的时候也没怎么看懂，感觉完全对不上啊
求拍砖指教！！欢迎讨论
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发表于 2014-5-16 21:20:55
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