He thinks growth will come when more digital books include video，activities，games and other ways to interact with the information.The technology is improving.But for now，most of the books are just words on a screen.

　　21．E-textbooks are not better than paper books in that________.

　　A．they cost more money

　　B．they’re difficult to carry

　　C．they’re not convenient to share

　　D．they can’t be downloaded from the Internet

　　22．How many surveyed students think paper books make better reading?

　　A．60%.

　　B．56%.

　　C．55%.

　　D．50%.

　　23．Northwest Missouri State University equips its students with computers to________.

　　A．help students to save money

　　B．make profits by renting e-textbooks

　　C．check whether students like using computers

　　D．make it convenient for them to read e-textbooks

　　24．Why are e-textbooks now available not satisfactory?

　　A．Readers cannot interact with the authors.

　　B．The contents cannot meet readers’ need.

　　C．Most of them are just words on a screen.

　　D．They lack necessary relevant information.

　　25．It can be inferred from the text that in the future________.

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