J) Since you can take most books home，but not magazines，take full notes when using the latter. Many libraries today provide a reprographic machine that can quickly copy pages you need from magazines and books.Ask about it：If you are working on a project of some size which will require repeated library visits，keep a small notebook in which you record the identification numbers of the books you will be using frequently.This will save you valuable time，because you won’t have to consult the card catalog or search aimlessly through the stacks each time you visit for material you seek.Sol fie of the very best books in any library are the reference books，which may not be taken home.Learn what topics they cover and how best to use them，for these books are wonderful repositories (储藏室、资料库)of human knowledge.

　　K) Your library can give you help on any subject.It can even be your business and legal advisor.How many times have you scratched your head over how to get a tax rebate(折扣)on your summer job? You，11 find guides to that.Want to defend yourself in traffic coup? Find out how in legal books at the library.

　　L) Library Projects Can Be Fun and Rewardin9.Here are a few ideas：

　　1.What are your roots? Trace your ancestors.Many libraries specialize in genealogy.

　　2.Did George Washington sleep nearby? Or Billy the Kid? Your library’s collection of local history books can put you on the trail.

　　3.Cook a Polynesian feast.Or an ancient Roman banquet.Read how in the library’s cook books.

　　4.Take up photography.Check the library for consumer reviews of cameras before you buy.Take out books on lightin9，composition，or darkroom techniques or—you name it!

　　M)If you haven，t detected by now my enthusiasm for libraries，let me offer two personal notes.I'm particularly pleased that in recent years two beautiful libraries have been named after me：a small community library in Quakertown，Pennsylvania，and the huge research library located at the University of Northern Colorado in Greeley.And I like libraries so much that I married a librarian.

　　46.The nucleus of any public library is the car，d catalog.

　　47.Yesterday’s best sellers are still good for readin9，which shouldn’t be overlooked.

　　48.The author suggests that people should go to the library for answers when things go wrong

　　49.The Reader，s Guide is a green—bound index which provides a guide to very latest expert information of any subject that interests readers.

　　50.The sure remedy to kick the TV habit is to take home from the library interesting books to read.

　　51.There are various kinds of fun and rewarding projects available in different libraries.

　　52.A notebook will help readers to record the identification numbers of the frequently used books which can’t be taken home.

　　53.Readers should not try to return the book taken from the stacks to their desk to its proper place.

　　54.When asking for help，readers are suggested not asking the reference librarians silly questions they ought to solve themselves.

　　55.When asking for help，readers are suggested not asking the reference librarians silly questions they ought to solve themselves.

　　答案：

　　46.The nucleus of any public library is the card catalog.任何公共图书馆的核心都是卡片目录。

　　【解析】 F)。细节题。根据句中的关键词The nucleus ofany public library可将本句定位在F)段的前四句。怎样找到这些，或其他你想找的书呢?很简单——用卡片目录。每次去图书馆的时候——我每周至少去一次——在做任何事之前，我每次都会径直走向卡片目录。它是所有公共图书馆的核心。