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. A的意思是看过摘要后刺激买书的人数要多于看完摘要后认为摘要可以代替买全本书的人数; 假设看完摘要后,原来的10个人中出现了变化; 3 7 买 2 2 不买 1 5