二次函数y=0.5(x+1)(x-3)的对称轴是______.
∵y=0.5(x+1)(x-3)=0.5x2-x-1.5,
∴对称轴x=-b2a=--12×0.5=1.
面部感觉障碍提示有损害的神经是()
A.迷走神经
B.面神经
C.滑车神经
D.副神经
E.三叉神经
________ Christmas Day,we often eat a turkey.[ ]
A. On
B. In
C. At
D. For