A：镁粉用作照明弹；铜丝用作导线
B：二氧化碳用作碳酸饮料；金刚石刻划玻璃
C：氢气用作清洁燃料；稀盐酸除铁锈
D：活性炭除去冰箱内的异味；干冰进行人工降雨
阅读理解，判断正（√）误（X）
I went to Chengdu three years ago. It is in Sichuan Province(省). It is the capital of Sichuan. It is in the west of China. The famous Chinese pandas live in Sichuan. I took some pictures for them. I climbed the mountains(山) with my parents.We had an interesting life.
①帮助父母做力所能及的家务
②积极服兵役，保家卫国
③积极参加人大代表的换届选举
④做服务社区的志愿者
— Look at my new shoes! They cost me 100 yuan.
— Really? My shoes are _______ than yours.
某商场2013年一月份到十二月份月销售额呈现先下降后上升的趋势，现有三种函数模型：
①f（x）=p•qx（q＞0，q≠1）；
②f（x）=logpx+q（p＞0，q≠1）；
③f（x）=x2+px+q．
能较准确反映商场月销售额f（x）与月份x关系的函数模型为____ （填写相应函数的序号），若所选函数满足f（1）=10，f（3）=2，则f（x）=____
准线为y=-2的抛物线的标准方程为（ ）
