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Mercury, one of the deadliest toxins, makes up approximately fifty percent of the amalgam used by dentists in sliver fillings. The effects of acute mercury poisoning are known-kidney failure, muscle tremors, memory loss, and even death. It is clear that responsible dentists should remove all of the patients silver fillings and replace then with filling of plastic composites.
Which of the following, if true, most strengthens the author's argument?
(A) Sliver fillings gradually corrode and small amounts of mercury leak from the amalgam.
(B) It is difficult to measure the amount of mercury in a person's body.
(C) Some patients have more than one filling per tooth.
(D) Mercury poisoning produces a range of subtle but distinctive symptoms.
(E) The materials for plastic composite fillings are readily available to dentists.

逻辑题的答案要找和line of reasoning相关的选项，而不是只是和某一个部分有关系的选项

水银有害，因为有汞，汞有毒，所以医生不能用。这个和塑料没毒医生可以用无关。

正确的选项应该是要么强调汞确实有毒，要么说水银会有害，要么说医生不能用水银。所以应该是A。A说水银会泄漏，也就是会进入人体,导致中毒，是前面的第二种情况

1) 充分条件之一：逻辑题的答案要找和line of reasoning相关的选项，而不是只是和某一个部分有关系的选项,

The materials for plastic composite fillings are not readily available to dentists.

结论： responsible dentists should remove all of the patients silver fillings and replace then with filling of plastic composites.

如果结论改为Dentists are considering to replace with filling of plastic composites 就有影响了。

这道题目选A是肯定没错，不过因为我后来第二遍做题的时候又深入想了一下觉得：是否是该题目的问法是strengthens the author's argument，那么把argument理解为premise＋conclusion，即argument是指一个推理到结论的过程，而不单指一个结论，所以要符合LOR的规则呢？如果题目问法只是说which one to strengthen the author's conclusion的话，那么E是否也可以是一个答案呢？因为毕竟只是support题，只要对conclusion起到一定的support作用就可以了。

以下是引用spacefleet在2006-10-12 17:34:00的发言：
I picked (E). My reasoning is a little odd (using an anology):
If I am a responsible doctor and I have a terminally illed paitent (say has AIDS).
I want to cure the patient, but the the cure is just not avialble.

But the passage doesn't mention if Mercury is available. I think, as for your anology, A is the premise of E

再顶一下自己的想法，其实这两种问法在实际题目中都有频繁出现，可能会导致考虑的侧重点不同。

以下是引用toseetoo在2006-10-11 13:14:00的发言：

多谢各位指点！

不知这个想法对否？还请各位指点一下。

再顶一下自己的想法，其实这两种不同问法在实际考试中都有频繁出现，可能会导致考虑的侧重点不同。