题目

已知抛物线y＝ax2＋bx＋c与x轴交于A、B两点，与y轴交于点C，其中点B在x轴的正半轴上，点C在y轴的正半轴上，线段OB．OC的长（OB<OC）是方程x2－10x＋16＝0的两个根，且抛物线的对称轴是直线x＝－2．【小题1】求A、B、C三点的坐标；【小题2】求此抛物线的表达式【小题3】连接AC、BC，若点E是线段AB上的一个动点（与点A．点B不重合），过点E作EF∥AC交BC于点F，连接CE，设AE的长为m，△CEF的面积为S，求S与m之间的函数关系式，并写出自变量m的取值范围；【根据句意,选择方框中所给单词的适当形式填空。show up, knock on, be worth, table manners, in different situations【1】—Can you tell me something about the _____________in China?—Sure.【2】When I was watching TV last night, someone _____________ my door.【3】I waited for him for a long time, but he didn't _____________at last.【4】Please tell me about how to give first aid _____________.【5】The film is a great success. It _____________watching.