To the sea captain's surprise he found that travel could also be quite pleasant.A. earth

问题补充：

To the sea captains surprise, he found that travel could also be quite pleasant.

A. earth

B. land

C. ground

D. playing

答案：

A. earth

(答案→)B. land

C. ground

D. playing

解析：

land与sea 相对，land travel 陆上旅游。