南乡子
李珣
烟漠漠，雨凄凄，岸花零落鹧鸪啼。
远客扁舟临野渡，思乡处，潮退水平春色幕。
已知抛物线y=ax2+bx+c（a≠0）的顶点坐标为（4,﹣）,且与y轴交于点C（0,2）,与x轴交于A,B两点（点A在点B的左边）．（1）求抛物线的解析式及A,B两点的坐标；（2）在（1）中抛物线的对称轴l上是否存在一点P,使AP+CP的值最小？若存在,求AP+CP的最小值,若不存在,请说明理由；
①﹣3a2•5a7=﹣15a9；
②x（x4﹣1）=x5﹣1；
③（a﹣1）•（b+1）=ab﹣1；
④ab2÷a2b=1．
则小亮一共做错了（ ）
某学习小组的同学在用多用电表研究热敏特性实验中，安装好如图所示的装置．向杯内加入冷水，温度计的示数为20℃，多用电表选择适当的倍率，读出热敏电阻的阻值R1．然后向杯内加入热水，温度计的示数为60℃，发现多用电表的指针偏转角度较大，则下列说法正确的是（ ）
从方框中选择恰当的句子补全对话。
A. We went there by car. B. When did you come back?
C. What did you do in Beijing? D. I went to Beijing with my parents.
E. We went shopping at Wangfujing Street.
A:Where did you go last summer holiday?
B:____
A:Did you go there by train?
B:No. My father bought a new car. ____
A:Wow! That's cool. ____
B:We climbed the Great Wall. And we took many pictures.
A:What else did you do?
B:____ And we bought many nice presents for our friends.
A:____
B:On July 25th.
）,且与y轴交于点C（0,2）,与x轴交于A,B两点（点A在点B的左边）．