The______tobuildupspacestationsontheMarsis,ifwecannotsayitisimpossible,atleastveryhardtofulfill.
A.admiration B.ambition C.administration D.orientation正确答案B
The______tobuildupspacestationsontheMarsis,ifwecannotsayitisimpossible,atleastveryhardtofulfill.
A.admiration B.ambition C.administration D.orientation正确答案B