Twain was restless when he was young and moved a lot, first eastward as a journeyman printer, up and down （）as a steamboat pilot.
A.the Mississippi B.the Back River C.the Firesteel River D.the Bark River正确答案A
Twain was restless when he was young and moved a lot, first eastward as a journeyman printer, up and down （）as a steamboat pilot.
A.the Mississippi B.the Back River C.the Firesteel River D.the Bark River正确答案A
