单选题 He hasn't analyzed why he tips so generously, but I think the proclivity stems from his high school years, when he worked as a busboy.
【正确答案】 A
【答案解析】解析:A.predilection嗜好,偏爱,偏袒;B.prosperity成功,繁荣;C.premeditation预谋,预先策划;D.preamble序文,前言。