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以下是引用sweetcorn在2004-1-13 11:19:00的发言：
15. Dental researcher: Filling a cavity in a tooth is not a harmless procedure: it inevitably damages some of the healthy parts of the tooth. Cavities are harmful only if the decay reaches the nerves inside the tooth, and many cavities, if left untreated, never progress to that point. Therefore, dentists should not fill a cavity unless the nerves inside the tooth are in imminent danger from that cavity.
Which one of the following principles, if valid, most strongly supports the researcher’s reasoning?
(A) Dentists should perform any procedure that is likely to be beneficial in the long term, but only if the procedure does not cause immediate damage.
(B) Dentists should help their patients to prevent cavities rather than waiting until cavities are present to begin treatment.
(C) A condition that is only potentially harmful should not be treated using a method that is definitely harmful.
(D) A condition that is typically progressive should not be treated using methods that provide only temporary relief.
(E) A condition that is potentially harmful should not be left untreated unless it can be kept under constant surveillance.
答案：C
思路：搭桥法，建立A与B的联系作者指出：补牙对牙齿的健康部分是一定有害的。而牙洞只有在已经露出神经后才是有害的。可是这种情形几乎不可能出现。因此牙医不应该随便给病人补牙除非牙龈神经已经露出。
A，提到无关信息：beneficial in the long term。
B,与题目相反
C有效的建立了两者的关系，即对于潜在的伤害不应用必然带来其他伤害的方法来治疗。
D,无关信息排除
E没有建立起有效的连接。
getzhen
我相信凭着mm的这份执着，
一定能考个大牛分的。 | 
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楼主
发表于 2004-1-14 23:04:00
