材料一：从“十一五”到“十二五”，随着国家科技重大专项“新一代宽带无线移动通信网”的实施，我国实现了从2G跟随，3G突破到4G同步的可喜成绩。5G时代，中国应该在国际竞争中跑在前列。

材料二：“没有理由，那么多企业做不好一个电饭煲！”在2016年全国两会上，格力电器董事长董明珠谈到“到国外买电饭煲”时怒了。2015年，中国科技进步贡献率达55．1%，国家创新能力世界排名提升至18位，装备制造业达到全球的33%。然而电饭煲等这样的“小物件儿”，暴露出我国科技的结构性短板。

材料三：***在政府工作报告中强调，加快建设质量强国，创造强国。到2020年，迈进创新和人才强国行列。

    Do you know about Xiong'an? It's a new city near Baoding. There is a big lake in Xiong'an. Yes, it is Baiyangdian Lake. It is very big. In summer, you will see many beautiful lotus flowers on the lake. Some are red. Some are pink. Many people like them. There will be many boats on the lake. And there will be many birds singing in the grass. Xiong'an is beautiful and new. You can come here by bus from Baoding. And you can come here by train. You will play in the water with your friends. You will eat delicious fish. You will take many wonderful pictures. You will have a nice trip in Xiong'an.

向CuO和铁粉的混合物中加入一定量的稀硫酸，微热，充分反应后冷却、过滤，在滤液中放入一枚洁净的铁钉．发现铁钉表面无任何变化，据此判断，下列结论正确的是（　　）