狒狒老weakern题 一问。求XDJM解下疑惑

terry_run

例2. Metropolis regulation limiting to four days the period during which milk can be sold to consumers after pasteurization is unreasonable. Under optimal conditions, pasteurized milk kept at 40 degrees Fahrenheit remains unspoiled for at least 14 days. If Metropolis current limitation were changed to eight days, milk prices would drop, but product quality would be unaffected.

  Which of the following, if true, would most seriously weaken the conclusion drawn above?

(A) Most consumers keep milk no more than three days after purchase.

(B) A recent survey showed that 20 percent of Metropolis consumers favored extending the current limitation on the sale of milk to 8 days.

(C) Metropolis’ grocery-store owners would prefer small, frequent deliveries of milk to larger, infrequent deliveries.

(D) Milk kept longer than 14 days after pasteurization generally presents no medical dangers if consumed.

(E) In Metropolis, conditions for handling and storing milk after pasteurization are seldom close to optimum.

一道FEIFEI 作为课堂讲解的老题 ,虽然我也选E 但感觉有疑惑,求XDJM指点12...

个人感觉FEIFEI 认为第一句话是结论,是否有误?

[此贴子已经被作者于2009-4-8 1:57:24编辑过]

sudagrape

第一句的确是结论：把经过巴士消毒的牛奶的保质期定位4天是不合理的

证据就是：1. 在乐观条件下，牛奶可以保持14天不坏

          2. 如果把期限改为8天，牛奶价格虽然会下降，但是质量不会有影响

E说储存牛奶的情况一般不乐观，攻击了第一个证据，削弱了结论。