请教feifei逻辑中的62题

fionalovesunny

62. Brushing your teeth regularlyno matter which toothpaste you use, will reduce your chances of tooth decay.Scientists have concluded that, when you brush, you reduce tooth decay byremoving the film of plaque血小板that forms on teeth and gums. So, you can forget about fluorides: brush yourteeth carefully and say goodbye to cavities.

Which one of the following is a criticism of thereasoning in the argument?

(A) Brushing with fluoridetoothpaste has been shown to reduce tooth decay.

(B) The fact that brushing will reduce tooth decay does notshow that fluorides are of no value.

(C) Few people adequately remove plaque by brushing.

(D) People have plaque on theirteeth most of the time.

(E) Scientists have been wrong about fluorides

为什么选b不选c 呢？ 求指点。谢谢

xiqiong

这题问的是如何批判argument的逻辑。
你就要找到argument的逻辑是什么样的。 它说：因为刷牙就可以减少牙齿decay，所以我们不用管氟，直接刷牙就好了。
简单的说就是： 一个方式有用转而推出另一个方式没用。 这是错的。就像我说：少吃点可以减肥，那我们跑步减肥没用。 这肯定是不对的。 B正是说明了这个。
C，这个和argument的逻辑没用任何关系呀~  估计你是题目理解错了？？

jane.seeker

这道题问的是论据为什么不能推导出论点而不是让你削弱论据。对论点的理解很重要，文章得出的论点应该是：So, you can forget about fluorides 即忽略了fluorides的作用，而通过之前的论据：无论用哪种牙膏刷牙都可以减少牙齿腐烂的可能性。并不能得出flourides无用的结论，故选b
而c的话，很明显是在削弱论据，并且削弱的还不充分，刷牙不能充分remove血小板并不能削弱刷牙可以减少牙齿腐烂可能性这一结论。