Questions 16-20 are based on the following passage:
Electronic books could change the way of reading, but people ought to consider their far-reaching impacts as well．”The e-book promises to cause a slow tragedy on life as we know it,” Jason Ohler, professor of technology, warned the world．He weighed the advantages and disadvantages of e-book technology’s impact on social relationships, the environment, the economy, etc．Before you read an e-book, consider the disadvantages．
He believed that the e-books increase harness of eye due to poor screen, replace a relatively cheap commodity with a more expensive one, and displace workers in print-book production and traditional publishing．E-books make it easy to share data, thereby threatening copyright agreements and reducing compensation of authors．
On the other hand, e-books save 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 new jobs 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 recyclable, solve the problem of eye fatigue, be sure the “have-nots” get the technology, and support e-book training in schools and business．
16．What is the purpose of this writing?
A．To encourage people to use more e-books．
B．To help people how to read e-books effectively．
C．To talk about the impacts of e-books on society．
D．To make e-books more popular with the students．
17．One of the advantages ofe-books is ________．
A．Theycancreate new jobs for everyone．
B．They can save paper and trees．
C．They mayenhance the relationgships among people．
D．They may help protect eyes．
18．One of the disadvantages ofthe use of e-books is that ________．
A．they may promote self-sufficiency in learning．
B．they may pollute the environment．
C．they may encourage self publishing．
D．they may make some people lose their jobs．
19．What is Jason Ohler’s attitude towards e-books?
A．Positive．
B．Indifferent．
C．Cautious．
D．Suspicious．
20．What is one of the problems which need to be solved?
A．Environmental protection．
B．E-book training in schools and business．
C．Society’s approval of e-books．
D．Convincingpeople of using e-books．
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