题目

阅读下面材料，根据其内容和所给段落开头语续写两段,使之构成一篇完整的短文。Ashwini was waiting at the door for her children, Amit and Anika.It was the last day of their exams and she had prepared tasty snacks for them.Mom, you know Rishit from my class? He always disturbedothers during the exam and copied from therm.'Hey, let me speak now, Anika said and kept gigglingall the time. Mom, one of the girls in my class had prepared a matchboxinstead of a soapbox.The kids continued speaking, giggling, and enjoyed pizzas tilllate evening. Ashwini was pleased to know （1）我们已学过的可用于分离或提纯物质的方法有：过滤、降温结晶、蒸发结晶等。为了达到下列实验目的，请将适当的方法填写在相应的横线上： ①工业上从海水中提取食盐 ________ ； ②硫酸铜溶液中加入氢氧化钠溶液后分离出氢氧化铜               。（2）实验室要配制一定量8％的Na2SO4溶液，一学生已开出的实验用品为：硫酸钠固体、烧杯、等质量的纸、托盘天平（含砝码、镊子）、量筒、胶头滴管、药匙和试剂瓶（带标签）。还缺少的必要试剂是                 ，仪器是                   。