14. 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.

(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.

我试试把我的解题思路讲一讲.

首先认真读题: 第一句(A), 可能是结论, 说在high-circulation的杂志上excerpting soon before publishing有效; 第二句是premises: increased sales (B1)和fees paid by M (B2). 所牵涉的事物: books, soon before it is published, high-circulation Mag, icreased sales, fees.

D是support题型的答案. 和A一样, 含有数学概念, 也极象正确答案. 但是我在以前的回复中讲过, 数学概念稍微复杂一些, A是很绝对的比较,N>M, 而D是间接的比较N=rM. 如果此等式不成立(取非),原结论成立吗? 当然. 如果N=M+p, 结论一样成立. 所以不是inference