题目

In October 2013, Davion Only made an appeal (请求) on the Internet. He had learned that his biological mother had died not long before. “My name is Davion and I’ve been in foster care (寄养照管) since I was born,” he said, “but I’m not giving up hope.” The heartbreaking appeal spread quickly, and Only’s foster agency received calls from more than 10,000 people. Only ended up travelling to Ohio to live with a family. But after Only got into a physical fight with one of his elder would-be brothers, the family changed their minds. Back in Florida, Only passed through 输尿管上端连接肾，下端连接 [　　] A．尿道B．膀胱C．肾小管D．肾静脉