为了除去下表物质中的杂质（括号内为杂质），所选试剂（过量）及操作方法均正确的是（   ）

	物质	选用试剂（过量）	操作方法
A	Cu（CuO）	氧气	通入氧气并加热
B	CO2（HCl）	氢氧化钠溶液	气体通过盛有氢氧化钠溶液的洗气瓶
C	N2（O2）	铜网	气体通过炽热的铜网
D	KCl溶液（K2CO3）	氯化钙溶液	加入氯化钙溶液充分反应后过滤

孔子设立私学，广收门徒，“弟子三千，七十二贤”，扩大了儒家文化的传播和影响。这表明
①教育具有传承文化的特定功能  ②教育是文化发展与创新的源泉
③教育是文化传播的一个重要途径  ④教育在人才培育中发挥重要作用

若关于x的一元二次方程x²+（k+3）x+2=0的一个根是﹣2，则另一个根是（　　）

为纪念郑和下西洋，原创大型情景剧《郑和下西洋》在中国航海博物馆进行了首场演出。人们之所以缅怀郑和，依据是（    ）

完形填空A
    Once upon a time, there was a lazy poor man living in a small house with spider webs(网) on the walls and mice running around. People1coming into such a dirty place and the poor man was lonely and2 every day. He thought he was unhappy 3poverty(贫穷).
    One day, the poor man dropped in on4wise old man and asked him for advice about5his life. The old man gave him a vase and said, "This is a magic vase6will bring you 7.
    The poor man looked at the vase 8 He wondered 9a vase in his poor house.10 ，he didn't want to throw away such a beautiful vase, so he brought it home and put it on the table. "11not right for something 12beautiful to be empty." The poor old man looked at the vase and thought. Then some flowers 13into it. That made the vase even14 "How can I have the vase next to a spider web?" he continued. At this, he started to clean the house and paint the walls. His house turned 15 a comfortable place immediately.
    The old man cheered up and he suddenly realized why he was unhappy. From then on, he worked hard and his life got better and better.