Modern technology has affected us in many ways. One of these concerns the medium 54 we acquire knowledge. Recently, more and more people have switched to the e-book, for they feel it has several advantages over the paper book. For example, an e-book reader is light and portable and has a very large storage space, which makes it more economical 55 . Also, it is easy to add not only pictures to the books being read, but also sound. The texts in the e-reader can be linked to information all over the Internet. Furthermore, because electronic books do not use paper, it is not necessary to56 trees to make them.
【題組】55.
(A) in person
(B) on display
(C) in no time
(D) in the end
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