题目

----Why are you so late? ---- I was on half the way when it _______to me that I had left my notebook home, so I had to fetch it. A．occurred          B．hit        C．happened              D．reminded 答案：A（2006•南通）如图，设直线y=kx（k＜0）与双曲线y=-相交于A（x1，y1）B（x2，y2）两点，则x1y2-3x2y1的值为（ ）A．-10B．-5C．5D．10