【大全-Test13-14】经典题目再讨论，大家快来指正

hazardous

Among the more effective kinds of publicity that publishers can get for a new book is to have excerpts of it published in a high-circulation magazine soon before the book is published. The benefits of such excerption include not only a sure increase in sales but also a fee paid by the magazine to the book’s publisher.
Which of the following conclusions is best supported by the information above?
(A) The number of people for whom seeing an excerpt of a book in a magazine provides an adequate substitute for reading the whole book is smaller than the number for whom the excerpt stimulates a desire to read the book.
(B) Because the financial advantage of excerpting a new book in a magazine usually accrues to the book’s publisher, magazine editors are unwilling to publish excerpts from new books.
(C) In calculating the total number of copies that a book has sold, publishers include sales of copies of magazines that featured an excerpt of the book.
(D) The effectiveness of having excerpts of a book published in a magazine, measured in terms of increased sales of a book, is proportional to the circulation of the magazine in which the excerpts are published.
(E) Books that are suitable for excerpting in high-circulation magazines sell more copies than books that are not suitable for excerpting.

我知道这题已经在CD上被mindfree作为CR解答例题讲解过，但是我认为正确答案A也是有问题的。
理由：
利用所谓的“取非原则”，如果A取非，即读完杂志上书摘就不买此书的人比读完书摘而去买此书的人多，也不会影响原结论成立，即此书的销量还是增加了，因为总是有一部分是因为看到了杂志上的书摘而去买此书的，从而为销售增长作出了贡献。

当然，我意识到了，我的这个推理成立的话有这样一个假设：题干中所说的increase是指此书在杂志上发表了书摘后，相比于没有在杂志上发表书摘的销量增加。但根据题目中的信息并不能足以判断它说的increase是否如我所指。

而且，我觉得这种情况是可能出现的：试想，如果这本杂志的受众是很奇特的人——这些人不会买不在这本杂志上发表书摘的书。这样，这本杂志的订阅者看到这本杂志上此书的书摘后而去买此书的人就可以被认为是a sure increase。

所以，我觉得此题没有最佳答案，不知道各位觉得我的推理如何，请大家多多参与讨论，for “win-win”，谢谢~