Henry Richardson s working in an important library. His job is to give new life to old books. Richardson has saved(挽救) the l

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问题     Henry Richardson s working in an important library. His job is to give new life to old books.
    Richardson has saved(挽救) the lives of many books.His first job is to wash the pages. He takes off the old cover, and places each page in water. Then he carefully puts each one between sheets(纸张) of paper to dry. Some of the pages may be very thin or have missing parts. Richard-son mends these while they are still wet. He places each one on a heavy sheet(块) of glass. Then he carefully puts small pieces of paper on the places which need mending. These pieces of paper are very thin.They look like part of the old paper.
    The washed pages are now white and clean. The pages are put together again in the old cover. At times, only the front and back parts of the old cover can be used. Sometimes a whole new cover must be made. Now the stronger, cleaner, and "newer" book s returned to the library, once again ready for use.
The old cover of the book ______

选项 A、must be used
B、is sometimes used
C、should never be used

答案B

解析 句意:书的旧封面____。推理题。文章中提到了几种旧封面使用情况,有的可用,有的部分可用,有的整体都不能用。所以A必须使用和C从不使用都不正确。B项符合题意。
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