Walt Whitman was a pioneering figure of American poetry. His innovation, first of all, lies in his use of ______, poetry without a fixed regular rhyme scheme.

A．he used his hands to gesticulate
B．the author’s boyfriend thinks so
C．many people in the cottage were going mad
D．his pulse stopped beating for sometime

A．the majors preferred the large oil sources like Negeria and Angola
B．the drilling sites of the large sources could be leased at a relatively low price
C．the petroleum potential of Ivory Coast and Equatorial Guinea has yet to be proved
D．the majors could not find the states in their oil map