There seemed to be no human beings in that village, and the only of life was a boat tied to a tree.
A. symbol
B. mark
C. signal
D. sign
网友回答
A. symbol
B. mark
C. signal
(答案→)D. sign
解析：考查名词辨析。Symbol 象征，符号 mark 标志 signal 信号，暗号 sign 迹象，符号 句意为那个村庄里好像没有人了，唯一的生命的迹象是一条系在树上的船。