— ____ — She is a nurse. A. Who is your mother? B. Is your mother a nurse? C. Where is your mother? D. What does your mother do? 答案:D二次函数y=ax2+bx+c,自变量x与函数y的对应值如表:x…﹣5﹣4﹣3﹣2﹣10…y…40﹣2﹣204…下列说法正确的是( )A.抛物线的开口向下B.当x>﹣3时,y随x的增大而增大C.二次函数的最小值是﹣2D.抛物线的对称轴是x=﹣