The most important representatives of American transcendentalism, which once flourished in New England as a philosophical and literary movement, are _________.
【单选题】
Who exerts the single most important influence on literary naturalism, of which Theodore Dreiser and Jack London are among the best representative writers?
【单选题】
As a great innovator in American literature, Walt Whitman wrote his poetry in an unconventional style which is now called free verse, which is ______.
① lyrical poetry with chanting refrains
② poetry without a fixed beat or regular rhyme scheme
③ poetry without rhymes at the end of the lines but with a fixed beat
④ poetry in an irregular metric form and expressing noble feelings