单选题请根据下面短文回答下列问题:
Henry Richardson is working in an important library. His job is to give new life to old books. Many of these books are very old or are the one and only copy in the world.
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. Richardson 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 is returned to the library, once again ready for use.

单选题 Why should old books be saved?

【正确答案】 C

【答案解析】[精析] 从原文第一段最后一句“Many of these books are very old or are the only copy in the world”可知拯救旧书的原因是许多书相当古老，或者是世上仅有的孤本。C项符合题意。

单选题 To save old books, Richardson first ______.

单选题 To dry the wet pages, Richardson ______.

【正确答案】 C

【答案解析】[精析] 细节题。从原文第二段第四句“Then he carefully puts each one between sheets of paper to dry”可知使书页干燥的方法是将书页置于干燥的纸张之间。C项符合题意。

单选题 The old cover of the book ______.

【正确答案】 B

【答案解析】[精析] 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。

单选题 Richardson mends old books ______.

【正确答案】 B

【答案解析】[精析] 细节题。从原文第一段第一句“Henry Richardson is a bookbinder in an important library”可知他的工作地点是图书馆。B项符合题意。