请各位大侠帮忙解一道逻辑题

xinglufree

Among the more effective kinds of publicity that publishers can get for a new book is to have excerpt of it published in a high--circulation magazine soon befor the book is published . The benefits of such excerption include not only a sure increasein sales but also s fee paid by the magazine to the book's publisher.

which of the following conclusion is best supported by the information above?

A The number of people for whom seeing an experpt of a book in a magazine provides an adequate substitute for reading the whole book is smaller than the number for whom the experpt stimulates a desire to read the book.

B Because the financial advantage of experpting a new book in a magazine usually accrues to the book's publisher, magszine editor are unwilling to publish excerpts from new books.

C In caculating the total number of copies that a book has sold, publishers include sales of copies of magazins that featured an experpt of the book.

D The effectiveness  of having experpt of a book published in a magazine, measured in terms of increased sales of books, is proportional to the circulation to 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.

正确答案是A

我不知道A为什么对，D为什么错。

ediewang

这个我也不明白~今天刚好也做到这个题目了~~同问啊！！