Briefly discuss the theme of Walt Whitman's volume of poems Leaves of Grass.

（ ）represents a new beginning in Emest Hemingway's career as a writer, concerning a volunteer American guerrilla fighting in Spanish Civil War.

• A、A Farewell to Arms
• B、For Whom the Bell Tolls
• C、The Sun Also Rises
• D、In Our 7Time

All the following Thomas Hardy's works are known as "novels of character and environment" EXCEPT（ ）

• A、Mrs. Warren's Profession
• B、The Return of the Native
• C、The Trumpet Major
• D、Jude and Obscure