英文阅读理解,我菜鸟啊~求答案~

英文阅读理解,我菜鸟啊~求答案~
Americans have contributed to many art forms, and jazz, a type of music, is one of the art forms that were started in the United States. Black Americans, who sang and played the music of their homeland, created jazz.
Jazz is a mixture of music of Africa, the work songs the slave sang, and religious music. Improvisation (即兴) is an important part of jazz. This is why a jazz song might sound a little different each time it is played.
Jazz bands formed in the late 1800s. They played in bars and clubs in many towns and cities of the South, especially New Orleans. New Orleans is an international seaport, and people from all over the world come to New Orleans to hear jazz.
Jazz become more and more popular. By the 1920s, jazz was popular all over the United States. By the 1940s, you could hear jazz not only in clubs and bars, but in concert halls as well. Africa, South America, and Europe meet and share their music at festivals on every continent. In this way jazz continues to grow and change.
36. Jazz is a kind of music which is created by _____
A) AmericansB) Black Americans
C) AfricansD) European
37. It took about _____years to make jazz popular in the United States.
A) 80 B) 200 C) 40 D) 120
38. Which of the following is NOT true?
A) Jazz is now popular all over the world.
B) Jazz is a mixture of African music, the work songs, the slave songs and religious music.
C) Jazz bands made their first appearance in the late 1800s.
D) New Orleans lies in the North of America.
39. From the text, it can be inferred that______.
A) jazz may become more popular as time goes on
B) jazz is only sung by the Black when working
C) the American people are all jazz lovers
D) New Orleans is the place where jazz was first produced
40. What can be the best title of the passage?
A) American Art Forms B) The Development of Jazz
C) The Music of Black American D) The Birthplace of Jazz