题目

— What did Tina say?   — Sorry, I didn’t  _________ what she said.    A. pay attention to         B. get on with         C. hold on to           D. look forward to 答案：A已知a是锐角，且点A（-1，y1），B（sin2a+cos2a，y2），C（-m2+2m-3，y3）都在二次函数y=2x2-4x+7的图象上，那么y1，y2，y3的大小关系是（ ）A．y2＜y3＜y1B．y1＜y3＜y2C．y2＜y1＜y3D．y3＜y2＜y1