ManyexpelssaythatBillyWilderchangedthehistoryofAmericanmovies．HeisoftencalledthebestmoviemakerHollywoodhaseverhad．Hewasknownformakingmoviesthatofferedsharpsocialcommentandadultsexualsituations．Wilderwasone

　　Many expels say that Billy Wilder changed the history of American movies．He is often called the best movie maker Hollywood has ever had．

　　He was known for making movies that offered sharp social comment and adult sexual situations．Wilder was one of the first directors to do this．

　　Between the middle 1930s and the 1980s，Billy Wilder made almost fifty movies．During that time he received more than twenty nominations（提名）from the Academy of Motion Picture Arts and Sciences．He won six of the Oscar awards．Wilder made famous movies like"Sunset Boulevard"．and"Double Indemnity．"He also directed"The Lost Weekend"，and"The Seven Year Itch．"

　　Wilder was born in 1906in the former Austro-Hungarian Empire．He started law school in Vienna，Austria at the beginning．Then he decided to abandon the major．By the 1920s，he was writing movies in Germany．However，the Nazis had risen to power in the nation．Wilder was Jewish，and he recognized that he had no future in Nazi Germany．Then he left Europe for America．

　　Billy Wilder had only eleven dollars when he arrived to settle in the United States in 1934．He formed a writing team with Charles Brackett．The two writers created many films together．

　　Wilder and Brackett wrote several successful movies．Wilder always praised this man as a friend and teacher whose humor and expert direction greatly influenced his work．

　　In his love stories．Billy Wilder did not follow the Hollywood tradition of sweet boy-meets-girl situations．He had an unusual way of showing relations between men and women．For example，one of his most successful films was"Hold Back the Dawn．"In 1944，Billy Wilder made a film called"Double Indemnity．"Some critics（评论家）said this movie established him as one of the greatest Hollywood directors．Billy Wilder died in Los Angeles in 2002after battling health problems．

　　21．What does the text mainly talk about？___

　　A．The hist