题目

How about taking __________ short break? I want to make __________ call. A. the; a  B. a; the C. the; the        D. a; a 答案：D 解析: 两空均填不定冠词，因为take [have] a break和make a call这两个短语中，break和call均为可数名词，其前应有不定冠词。设函数f(x)＝|2x＋1|－|x－4|. (1)解不等式f(x)>2；(2)若函数f(x)≥m恒成立,求m的最大整数值．