Chооse the sentence thаt best expresses the implied mаin ideа оf the paragraph below. Fifty years ago, public libraries were, for the most part, rather no-frills places. There were shelves of books, a rack of well-thumbed magazines, and a tight-lipped librarian behind a desk who commanded everyone to speak in a whisper, if at all. Today’s libraries, however, are exciting and adaptable “media centers” where people of all ages come to select from among a vast and constantly changing array of books, magazines, audio books, videos, CDs, and DVDs. In addition, today’s libraries often feature computers with internet hookups and kiosks where patrons may refresh themselves with their favorite beverage or snack. And the librarians, too, are a far cry from yesterday’s rigid relics. Most likely, they are people who are at home with the latest information technologies and, thus, happy to share their expertise.