题目

对于函数y=﹣2（x﹣m）2的图象，下列说法不正确的是（   ）           A. 开口向下                      B. 对称轴是x=m                      C. 最大值为0                      D. 与y轴不相交 答案： D A: ________ I go to the airport to see Uncle David off tomorrow morning, mum? B: No, you needn’t. You may join us if you want to.  A．MustB．NeedC．ShouldD．May