Amazon, which got its start selling books online, announced this year that, for the first time, its digital books had outsold

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问题     Amazon, which got its start selling books online,
announced this year that, for the first time, its digital books
had outsold than paper books. This trend of going digital does【M1】______
not hold true for all books: While many popular consumer
books have successfully made the switch into the new form,【M2】______
textbooks are already widely read on paper. Textbooks are【M3】______
gaining, consequently, as publishers take advantage of the【M4】______
popularity of tablets like the Kindle and iPad, expanding their
catalogues and offering products like rent digital books that【M5】______
expire after a semester or two.
    The potential for digital growth is leading publishers to
experiment products that stretch the boundaries of traditional【M6】______
textbooks, slowly turning away from static text and images
toward multimedia, intuitive approach, publishers say.【M7】______
"Textbooks as e-books ought to be seen as a stepping stone of【M8】______
the future," said Mark Majurey of Taylor & Francis, a
textbook publisher in Britain.
    Digital textbooks are any books which can be downloaded【M9】______
to an e-reader or computer or those that can be read online
using a Web browser. While no one keeps precise numbers of
digital textbook sales globally, a number of companies have
seen similar growth patterns and nearly identical market share.
According to the Student Monitor, a private student market
research company based in New Jersey, about 5 percent of all
textbooks required in the autumn in the United States were【M10】______
digital textbooks. That is more than double the 2.1 percent of
the spring semester.
【M9】

选项

答案which—that

解析 语法错误。本题考查的是定语从句先行词which和that的区别。当先行词是anything,everything,nothing,all,none,some等不定代词时,或是由every,any,all,some,no等修饰时,定语从句只能用that引导。
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