问题
选择题
某校九年级（1）班50名学生中有20名团员，他们都积极报名参加学校开展的“文明劝导活动”．根据要求，该班从团员中随机抽取1名参加，则该班团员京京被抽到的概率是（ ）
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答案
全部是20名团员，抽取1名，所以被抽到的概率是
．故选C．1 20
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某校九年级（1）班50名学生中有20名团员，他们都积极报名参加学校开展的“文明劝导活动”．根据要求，该班从团员中随机抽取1名参加，则该班团员京京被抽到的概率是（ ）
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全部是20名团员，抽取1名，所以被抽到的概率是
．故选C．1 20
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| A library is a place to find out about anything. In it there are mostly books, but there are also pictures, papers, maps, magazines and records. Special science and art shows, story hours, films, plays and contests may also be 1 in a library. Long ago a library had only books, and other things were 2 to get. There were so 3 books that no one was 4 to take them out of the library. After the printing machine was 5 , books could be made faster and librarians got more books. To borrow a book to 6 home today, a person just 7 a library card. The person goes to the main desk to have a librarian check the book out. The librarian prints the card with the 8 by which the book must be returned. If the book is returned 9 , the person must usually pay money for having broken the 10 . Books in a library are put in a certain 11 to help people to find 12 they want. In some libraries, all books about animals might be placed together. In 13 libraries, all books 14 by the same person may be placed together. Cabinets of cards list each book and tell where it can be found. People who live in the country may have trouble going to a city library. For these people there are librarians on wheels that 15 from place to place. | ||||
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