题目类型：
单选题
题目内容
Walt Whitman was a pioneering figure of American poetry. His innovation first all lies in his use of ______, poetry without a fixed beat or regular rhyme scheme.
正确答案
C
题目解析
惠特曼创造了“自由体诗”，没有固定的节奏和用韵。答案为C(P450)。