Books haven’t changed much since Johann Guttenburg invented the printing press in the fifteenth century. The methods for produci

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问题      Books haven’t changed much since Johann Guttenburg invented the printing press in the fifteenth century. The methods for producing books are, of course, far more sophisticated, but in the end, a book remains a sequential, static【B1】______ .This type of organization is made-to-order for novels, in which a story is read from page one to the end. The printed page, however, has its【B2】______  for just about any book or document that contains an index, including all varieties of reference books, encyclopedias, "how to" books,【B3】______ , and textbooks.
     Over the next few years, the printed pages of college textbooks will begin their【B4】______ to a technology-based presentation. Nobody knows for sure what the textbook of the future will look like. Most【B5】______ and publishers agree, however, that change is just over the【B6】______ . Perhaps it is time to 【B7】______ on what that technology will look like and what it will bring to the classroom—or possibly the home, the office, the student union, the car…
     The interactive book, or i-book will offer many【B8】______ over traditional books. Static figures will come alive with animation. Motion video will be available to demonstrate, elaborate, or clarify.【B9】______ .The i-book will help readers identify and overcome gaps in understanding. Readers will be able to click on or touch "active words" to display related material. When linked to the Internet,【B10】______ . Margin notes can be written or spoken.【B11】______ .
【B4】

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答案transformation

解析 空前的物主代词their提示所填词为名词。空后的介词to提示所填词的名词表示动作。下文中that change提示所填词表示“变化,演变”的含义。transformation意为“变化”,trans一是前缀,有“转换”之意。
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