There seemed to be no human beings in that village and the only of life was a boat tied

问题补充：

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

答案：

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。