(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.

答案是A

答案是A没有问题的，不过我想问一个其他的问题。

一般来说，这种在杂志上发表摘要是应该book publisher 给杂志钱啊，相当于做广告了，为什么反而是杂志要付费呢？

谢谢大家哦。

付的是版权费

作者写的书杂志登出来作者怎么能不收钱呢

答案A为什么没问题 我觉得有问题啊

材料中说  采取这种方法能产生 a sure increse in sales

但是sales增加  并不能推出the number of ~~~ is smaller than the number of ~~

因为假定原先有5个买 10个不买

现在采取这种方法后 7个买 8个不买     

买的人数是增加了 从5到7   但是不买的人数可以比买的人多啊 8比7

你的这个假定有问题吧？并不是只有一定数量的潜在顾客（比如15人）。

答案a中明确地告诉了：看了杂志后，不买书的要比买书的人数少。

否则就不会：a sure increase in sales

是不是应该这样想啊，人分四类

1不管看没有看到杂志都想买书的

2不管看没有看到杂志都不想买书的

3本来想买书但是看到杂志就不买了

4本来不想买看了杂志后就想买了

A虽然是正确选项，但我有一点很困惑，就是做逻辑题一般是排除一些原文中没有提到的事物，但是

A中的 the number of people 原文中不是也没有提到吗？

我觉得这里the number of people 实际上就是 a sure increase in sales.

author一般把copyright给publisher,所以publisher收取（或代理收取）copy right 使用费。