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  3. Mouth cancer is a danger for people who rarely brush their teeth. In order to achieve early detection of mouth cancer in these i

Mouth cancer is a danger for people who rarely brush their teeth. In order to achieve early detection of mouth cancer in these i

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问题 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?
选项 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.
答案E
解析 本题为典型的就目的提方法的“B，A”，反对思路可用“A不可行或A无意义”。如果很少刷牙的人不大可能每周对他们的口腔进行检查，(即A不可行或无意义)，正如(E)所说，那么也就表明能在早期发现很少刷牙人的口腔癌这个目的不能实现，所以(E)正确；(A)选项并未告知有无mouthcancer；(B)讨论的是“治疗”，但段落推理讨论的是“检查”；(C)为无关选项；(D)做了无关比较。
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