单选题  The underlined word "serene" in the last sentence is closest in meaning to______. 
【正确答案】 B
【答案解析】词语理解题。"serene"修饰climate,且由serene climate定语"in which to study for final exams" 可知,这个环境适合为迎接期末考试而学习,因此应当是"安静,祥和"环境。B符合题意,故选B。