题目

若函数，则（ ）A.1 B.2 C.3 D.4 答案：【答案】C【解析】先求得的值，然后求得的值.依题意，所以.故选：C. —What time is it? 　　—It’s 7:25. Let’s be quick, or we will ______ the first bus. 　　A. cause B. miss C. lose D. catch