Câu hỏi:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 41 to 45.

Langston Hughes was  one  of  the  greatest  American  writers  of  the  20th century.  He  was  born  in Joplin, Missouri, and moved to Cleveland at the age of 14. Several years later, he spent one year in Mexico before attending Columbia University in New York. For a few years after that, he roamed the world  as  a  seaman,  visiting  ports  around  the  world  and  writing  some  poetry.  He  returned  to  the United  States  and  attended Lincoln  University,  where  he  won  the Witter  Bynner  Prize for undergraduate poetry. After graduating in 1928, he traveled to Spain and to Russia with the help of  a Guggenheim fellowship.  His  novels  include Not  without  Laughter (1930)  and The  Big  Sea (1940).  He  wrote  an  autobiography  in 1956  and  also  published  several  collections  of poetry.  The collections  include The  Weary  Blues (1926), The  Dream  Keeper (1932), Shakespeare  in  Harlem (1942), Fields of Wonder (1947), One Way Ticket (1947), and Selected Poems (1959). A man of many talents, Hughes was also a lyricist, librettist, and a journalist. As an older man in the 1960s, he spent much  of  his  time  collecting  poems  from  Africa  and  from  African-Americans  to  popularize  black writers. Hughes is one of the most accomplished writers in American literary history, and he is seen as one of the artistic leaders of the Harlem Renaissance, the period when a neighborhood that was predominantly  black  produced  a  flood  of  great  literature,  music,  and  other  art  forms depicting daily city life for African-Americans.

What is the main topic of this passage?