题目

 Ten years ago___ only one building in our school. And in 10 years，  _______ five buildings in our school.                                A. there will be, there are     B. there was, there are                   C. there was, there will be              D. there will be; there was 答案：C（满分12分）已知函数（x∈R）．（1）若有最大值2，求实数a的值；（2）求函数的单调递增区间．