C．has nowhere to put his books

　　D．has earned the required credits

　　D　[细节理解题。题干中的locker出现在Storage of Study Material中，四个选项中出现文中所提到信息有A和D，但和文中这句"When you have obtained at least 40 credits，you may rent a locker..." 如果学生已经获得了所需的学分，他可以在图书馆租一个柜子。选D。]

　　B

　　In the 1940s，Lena Horne was the first African­American in Hollywood to sign a long term contract with a major movie studio.Her deal with MGM stated that she would never play the role of a servant.During this period，African­American actors were mostly limited to playing servants or African natives.

　　But this refusal also limited her movie career.Horne was generally only offered the role of a nightclub singer.Her characters did not interact with white characters in these movies.This way，her part could be cut from the version of the movie that played in Southern States.

　　Lena Horne later wrote that the movie producers did not make her into a servant，but they did not make her into anything else，either.Lena Horne once said that World War Ⅱ helped make her a star.She was popular with both black and white servicemen.She sang on army radio programs and traveled to perform for the troops.During one event，she noted that German prisoners of war were permitted to sit closer to the stage than black soldiers.These experiences led to Lena Horne's work in the civil rights movement.

　　She protested racial separation at the hotels where she performed.She took action so that she and her musicians would be permitted to stay in those hotels.Black musicians at the time generally stayed in black neighborhoods.Lena Horne also sang at civil rights gatherings.She took part in the March on Washington protest in 1963.It was during this event that Martin Luther King Junior gave his "I Have a Dream" speech.

Lena Horne performed in a strong and expressive way.One expert said she was not warm and amiable like white female singers at the time.Instead，she was a fierce