物质的分离、提纯对于人类的生产、生活和科学研究具有十分重要的意义，下面除去物质中杂质的方法，正确的是（  ）

Read and finish.读短文，按照要求完成任务

    John and Sarah are good friends. John has short hair. Sarah has long hair. They have a new classroom. Look! One blackboard, one TV, two doors, many desks and chairs. The TV is big. The doors are orange. The desks are green. The TV is near the door. There are many pictures on the wall. The new classroom is very nice. They all (都)like it.

Read and judge. 判断正误。

2017年4月28日上午，临沂市举行“文明出行﹣守护斑马线”志愿服务项目认领仪式。来自我市各大志愿服务组织的志愿者们纷纷进行项目认领（项目内容包括：交通路口疏导员；交通路口清洁员；交通路口非机动车劝导员；交通路口行人交通规则守护员；交通路口指路员。）通过自己的力量开展文明出行志愿服务活动，为文明城市建设增砖添瓦，为“大美新”临沂增添绚丽色彩。