求解一题，大家帮忙！

jm2003222

The milk of many mammals contains cannabinoids, substances that are known to stimulate certain receptors in the brain. To investigate the function of cannabinoids, researchers injected newborn mice with a chemical that is known to block cannabinoides from reaching their receptors in the brain. The injected 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?
 
 Newborn mice do not normally ingest any substance other than their mothers' milk.  
 
 Cannabinoids are the only substances in mammals' milk that stimulate the appetite.  
 
 The mothers of newborn mice do not normally make any effort to encourage their babies to feed.  
 
 The milk of mammals would be less nutritious if it did not contain cannabinoids.  
 
 The chemical that blocks cannabinoids from stimulating their brain receptors does not independently inhibit the appetite.  
答案是E，不明白，我认为是B，欢迎讨论!!

Rebeldom

你说的是对的,但是题目不是问支持还是削弱
而是哪个选项是我们必须知道到底发生了没有的
那么根据你的理解,就应该选E,最重要的就是知道城市里的店有没有降低鱼的销售价格,使得利润不一定高于周边的海产品商店

jm2003222

B选项看不出有什么明显的支持,
E选项很明显,在实验中加入了一种CHEMICAL,如果这种CHEMICAL本身就能抑制食欲,就不能说是CAN...抑制食欲,所以必须前提假设这种加入的CHEMICAL并没有抑制食欲的功能

-- by 会员 Rebeldom (2010/5/10 11:40:16)

哦哦。。知道了。。谢谢哈！
还有一题能帮忙看下嘛Fish currently costs about the same at seafood stores throughout Eastville and its surrounding suburbs. Seafood stores buy fish from the same wholesalers and at the same prices, and other business expenses have also been about the same. But new tax breaks will substantially lower the cost of doing business within the city. Therefore, in the future, profit margins will be higher at seafood stores within the city than at suburban seafood stores.

For the purposes of evaluating the argument, it would be most useful to know whether.

	more fish wholesalers are located within the city than in the surrounding suburbs.
	Any people who currently own seafood stores in the suburbs surrounding Eastville will relocate their businesses nearer to the city
	The wholesale price of fish is likely to fall in the future
	Fish has always cost about the same at seafood stores throughout Eastville and its surrounding suburbs.
	Seafood stores within the city will in the future set prices that are lower than those at suburban seafood stores. 我感觉D说的是鱼的成本一样，那一样的话，那个税少了，利润就自然增加了嘛，E就不一定了，鱼的价格低了，因此利润不一定会高吧

Rebeldom

B选项看不出有什么明显的支持,
E选项很明显,在实验中加入了一种CHEMICAL,如果这种CHEMICAL本身就能抑制食欲,就不能说是CAN...抑制食欲,所以必须前提假设这种加入的CHEMICAL并没有抑制食欲的功能