152. Mouth cancer is a danger for people who rarely brush their teeth. In order to achieve early detection of mouth cancer in these individuals, a town’s public health officials sent a pamphlet to all town residents,describing how to perform weekly self-examinations of the mouth for lumps.

Which of the following, if true, is the best criticism of the pamphlet as a method of achieving the public health officials’ goal?

(A) Many dental diseases produce symptoms that cannot be detected in a weekly self-examination.

(B) Once mouth cancer has been detected, the effectiveness of treatment can vary from person to person.

(C) The pamphlet was sent to all town residents, including those individuals who brush their teeth regularly.

(D) Mouth cancer is much more common in adults than in children.

(E) People who rarely brush their teeth are unlikely to perform a weekly examination of their mouth.

key is E. What's wrong with A? self-examination can not help to detect the symptom, and thus can not achieve the official's goal of early detection of mouth cancer.

tks.

我觉得不是因为A选项 

原文结论讲的是detection of mouth cancer ，A讲的是Many dental diseases ，不一定包括mouth cancer

 因为本来目的就是early detection.那必然是检查dental diseases或者其他mouth diseases（可能是caner的前兆）,所以不包括mouth caner是合理的。

.我的理解是这样，不知道对不对？

结论：early detection of mouth cancer

论据：pamphlet describing how to examination

削弱：这些人不examination

如果证据是：pamphlet describing the effectiveness of examination答案就可以选A

还有就是证据的词眼在于how to。所以要削弱就是要削弱这个how to examination对detection有没有用,而不是examination对detection有没有用。你说什么有些病表现检查不出来，或者lump不是癌症前兆等等，那都与原文推理无关。这样想就恰好迎合了OG的对A 的解释：Choice A is incorrect because it does not specifically cast doubt on self-examination as a means of detecting mouth cancer

我的逻辑很差，：）GWD狂错的那种人。只是提点想了半天的看法。

A的提法不明确. Many dental diseases ...

和E比, A肯定不是 the best criticism

选最好的答案!