题目

在一段坡路，小明骑自行车上坡的速度为每小时V1千米，下坡时的速度为每小时V2千米，则他在这段路上、下坡的平均速度是每小时（    ） (A)千米；  (B)千米；    (C)千米；    (D)无法确定 答案：CThe Universal Autograph (名人签名) Collectors Club(UACC) has been serving the collector for over 25 years. Founded in 1965, the UACC began as a small group of Long Island. New York autograph collectors and has grown to be the largest collector’s organization of its kind. The UACC by its purpose is primarily an educational fellowship(联谊会) where knowledge and resources are shared with not only the membership, but also the public at large. By joining the UACC, you will be introduced to the fastest growing hobby in the world today. Autographs have been called “frozen moment in time” by some people. Probably the most personal thing that one person can give is his or her signature. In 1843, former President James Madison sent an autograph for a collection which the Princess Victoria was making. The future British Queen was only 15 years old at the time. Financier J.P. Morgan, Sr. began collecting when he was 16, and his son continued adding to the father’s collection. As the daughter of the Mayor of Boston, Rose Fitzgerald collected autographs, as did her son, John F. Kennedy. Franklin Roosevelt, Malcolm Forbes and Glenn Ford are a few more well-known autograph collectors. By collecting autographs, you become a curator(馆长) of history. Here are some of the best reasons to join the UACC. The UACC publishes The Pen and Quill, the highly regarded 64-page bimonthly journal with articles and news in all fields of autograph collecting. UACC members may place free ads in The Pen and Quill to express their wants or just swap with other members.Writing for autographs to famous living people can also be interesting. The more interesting the letter, the better chance for an interesting reply.The UACC also offers its members the opportunity to buy uncommon autographic materials at low prices. Meanwhile, it publishes low-cost reference works for its members.Once you join the UACC, you will be added to our mailing list and will receive catalogs(目录) of autographs for sale by dealer members. The UACC has nearly 200 of the world’s most professional dealers as members. Each member provides contact information on our website, including mailing address, telephone numbers, e-mail-addresses, website address, etc. We always try to promote our dealer program and encourage collectors to always buy from these dealers1.Paragraph 4 is presented to inform you that __________A.autographs might be the most personal thing that one can giveB.the hobby started as early as the 19th centuryC.autographs have a long history and was popular even among great peopleD.autographs reflect history and sometimes change history2.What does the underlined word “ swap” probably mean?A.write for autographsB.exchange autographsC.mail autographsD.sign autographs3.Which of the following about the service offered by the UACC is NOT right?A.It offers member a good way in which they can get what they need much easilyB.A magazine is published every two months to help you know about the world’s hobbyC.It offers collectors great deals on unusual autographs at reasonable pricesD.It offers Internet service to make extra profits4.This passage is mainly__________A.to encourage you to join the UACCB.to tell you how interesting autograph collecting isC.to tell you the fast development of the autograph collectingD.to inform you where you can get an autograph