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. 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 from 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. ( ) 36 . Why should old books be saved? A . Because they give us a lot of information. B . Because they are very interesting: C . Because they may be the only copy. ( ) 37 . To save old books, Richardson first . A . places the wet pages on a sheet of glass B . washes the pages C . mends the cover ( ) 38 . To dry the wet pages, Richardson . A . leaves them in the sun B . places them on a sheet of glass C . puts them between sheets of dry paper ( ) 39 . The old cover of the book . A . must be used B . is sometimes used C . should never be used ( ) 40 . Richardson mends old books . A . in a hospital B . in a library C . at home