题目

— I don't know when ________ tomorrow. — I will call you as soon as he ________. A . will he come; arrives B . he will come; arrives C . he will come; will arrive D . will he come; will arrive 答案：B如图，P为抛物线y=x2-x+上对称轴右侧的一点，且点P在x轴上方，过点P作PA垂直x轴于点A，PB垂直y轴于点B，得到矩形PAOB．若AP=1，求矩形PAOB的面积．