A:重振雄风,再创辉煌
B:四班一声吼,地球抖三抖
C:青春活力扬,雄风震赛场
D:黄沙百战穿金甲,不夺冠军死不还
函数f(x)=cos2x+6cos( π2 ﹣x)的最大值为( )
When you get out of the taxi,make sure that none of your possessions are________.