62. Brushing your teeth regularly no matter which toothpaste you use, will reduce your chances of tooth decay. Scientists have concluded that, when you brush, you reduce tooth decay by removing the film of plaque that forms on teeth and gums. So, you can forget about fluorides: brush your teeth carefully and say goodbye to cavities. Which one of the following is a criticism of the reasoning in the argument? (A) Brushing with fluoride toothpaste has been shown to reduce tooth decay. (B) The fact that brushing will reduce tooth decay does not show that fluorides are of no value. (C) Few people adequately remove plaque by brushing. (D) People have plaque on their teeth most of the time. (E) Scientists have been wrong about fluorides.
关于A选项,我看了半天...如果考场里面的话肯定会选A的.... 明白这里的推理过程:不管是什么牙膏,认真刷牙都可以防止蛀齿->忘记氟化物,认真刷牙就可以和蛀齿说88了~ 其实也正如所说:即一个事实成为一个结果的充分条件，并不排除其它事实也是充分条件的可能。这里刷牙可以防蛀，但这病不能否认其它因素对防止蛀牙的效用。 A为什么不可以这样理解氟化物还是有所用(因为它也可以防止蛀齿)可以么?直接否认作者认为氟化物没有作用..... 那正确的理解应该是什么? 附上feifei详解版的解释: A. 结论中显示了作者对于两者的态度，否定氟化物，肯定刷牙。削弱则必须肯定氟化物，把不同类的两者放在一起，因果的关系不明显，容易混淆。 | 
