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阅读下面短文，根据其内容写一篇 60 词左右的内容概要。 Two yearsago, Li Yuhua's daughter taught herhow to shop online. Since then, the 51-year-old farmer in Wushan has been aregular online shopper. Shoppers like Li Yuhuaare the new target for China's ecommerce giants, including AlibabaGroup, which operates the Taobao platform,and JD.com. Rural China added 3 million more Internet users in the first half,taking the total number to 225 million, or 26.3%, of the country's total Internetpopulation of 854 million, according to a report on rural ecommerce developmentreleased las 将一定量的铁粉加入到AgNO3和Cu(NO3)2的混合溶液中，当铁与Cu(NO3)2恰好完全反应后，过滤。则以下的分析中正确的是 A．滤纸上留下的物质是铜             B．滤纸上留下的物质有铜和银 C．滤液中的溶质是AgNO3              D．滤液中的溶质是Fe(NO3)3