64. The old cover of the book                  .
　　[ A ] must be used
　　[ B ] is sometimes used
　　[ C ] should never be used

　　65. Richardson mends old books                  .
　　[ A ] in a hospital
　　[ B ] in a library
　　[ C ] at home

　　请根据下面的短文回答第66－70题：

　　The Maryland Science Center is more than fun. You can enjoy the three floors of exciting things, watch the larger-than-life play on the 4th floor, and travel to other worlds, to far away stars, on the 5th floor.

　　Don' t just look. You are expected to feel, to turn, to push. Build your own house and learn　why it stands or falls. Use computers to work out plans just as famous scientists have done. There is always something new to learn at the Maryland Science Center.

　　Children and group visitors enjoy half price.

　　The excitement of the Maryland Science Center does not end when you leave. Visit the Science　Store for a gift you' d like to keep. Electronic jewelry( 电子珠宝), games, books, and more --take part of the Science Center .home with you.

　　Information
　　Where to call:
　　24 hour general(常规的) information(410)685-5225
　　24 hour STARLINE night sky information (410)539-STAR
　　Group visitor information (410) 685-2370

　　Hours:
　　The Maryland Science Center is open 7 days a week (except Thanksgiving Day and Christmas
　　Day )
　　Monday－Friday                                 10 a. m. -6 p. m.
　　Saturday and Sunday                            10 a. m. -8 p. m.

　　66. What can visitors do at the Maryland Science Center?
　　[ A ] Learn science by trying it out.
　　[ B ] Watch and take part in a play.
　　[ C ] Make gifts for their friends.

　　67. The Maryland Science Center stays open                 .
　　[ A ]every day from 10 a.m. to 8 p.m.
　　[ B ] almost all the weekdays and weekends
　　[ C ] on Thanksgiving Day and Christmas Day

　　68. By calling (410)685-2370 we can get information about              .
　　[ A ] the night sky show
　　[ B ] books and games
　　[ C ] group price tickets

　　69. "Take part of the Science Center home with you" means that               .
　　[ A ] visitors can buy something there and take them home
　　[ B ] the Science Center may be sold to visitors