Dental researcher: Filling a cavity in a toothis not a harmless procedure: it inevitably damages some of the healthy parts ofthe tooth. Cavities are harmful only if the decay reaches the nerves inside thetooth, and many cavities, if left untreated, never progress to that point.Therefore, dentists should not fill a cavity unless the nerves inside the toothare in imminent danger from that cavity.

　　Which one of the following principles, ifvalid, most strongly supports the researcher’s reasoning?

　　A. Dentistsshould perform any procedure that is likely to be beneficial in the long term,but only if the procedure does not cause immediate damage.

　　B. Dentistsshould help their patients to prevent cavities rather than waiting untilcavities are present to begin treatment.

　　C. Acondition that is only potentially harmful should not be treated using a methodthat is definitely harmful.

　　D. Acondition that is typically progressive should not be treated using methodsthat provide only temporary relief.

　　E. Acondition that is potentially harmful should not be left untreated unless itcan 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。

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