E-books are books that can be read through an electronic medium. 49 , these books are not on paper; they are read digitally on a computer, laptop, or e-reader. Many people feel that the e-book is the greatest innovation in the literary world. E-books were not as popular in the earlier 1990s 50 , thanks to high-speed portable reading devices 51 thousands of books can be stored, people have slowly started taking an interest in e-books. As a matter of fact, in July 2010, Amazon.com reported that more e-books were sold than hardcovers.52 this new technology’s popularity in mind, Google also launched Google eBooks in 2010. Through this service, all the books that Google has scanned, converted to text, 53 in its digital database can be viewed and searched. With such a service, the traditional hardcover book may soon be a thing of the past.
【題組】51.
(A) where
(B) which
(C) when
(D) what
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