题目

—Must I attend tomorrow’s meeting? —Yes. The meeting is _____. Besides, I have something _______ to discuss with you.  A. of great value; great valuable     B. very valuable; of great value  C. great valuable; of great valuable  D. very value; very valuable 答案：B已知函数f（x）=sin（ωx+φ），（ω＞0），f（x）图象相邻最高点和最低点的横坐标相差π2，初相为π6．（Ⅰ）求f（x）的表达式；（Ⅱ）求函数f（x）在[0，π2]上的值域．