题目内容：
根据下列内容，回答题。Electronic books could revolutionize reading, but people ought to consider their far-reaching.
"The e-book promises to wreak a slow havoc on life as we know it," Jason Ohler, professor oftechnology assessment, University of Alaska Southeast in Juneau, warned the World Future Soci-ety, Bethesda, Md. His assessment weighed the pros and cons of e-book technology's impact on social relationships, the environment, the economy, etc. Before you curl up with an e-book, con-sider the disadvantages.
They increase eyestrain due to poor screen resolution, replace a relatively cheap commoditywith a more expensive one, and displace workers in print book production and traditional publish-ing. E-books make it easy to share data, thereby threatening copyright agreements and reducingcompensation of authors, as well as creating nonbiodegradable trash. On the other hand, e-bookssave paper and trees, reduce the burden of the carrying and storing of printed books, promote self-sufficiency in learning, and make reading a collaborative experience online. They also create newjobs for writers and artists and encourage self-publishing. In final analysis, Ohler points out, e-books should gain society's approval if a few conditions are met: make them biodegradable andrecyclable, solve the problem of eye fatigue, be sure the "have-nots" get the technology, and sup-port e-book training in schools and business.
What is the author's purpose of writing the passage?___________ A．Draw people's attention to the disadvantages of e-books.
B．Call on people to reject e-books.
C．Criticize schools and business that don't provide e-books.
D．Encourage people to use e-books.
参考答案：
答案解析：