5.听第三段材料,回答第15至第17小题. 15.What's Mike going to do in London? A.To do some shopping. B.To see his uncle. C.To visit some places. 16.Has Lily ever been to Beijing? A.Yes,she has. B.No,she hasn't. C.We don't know. 17.Where will Lily visit? A.The Great Wall. B.Hong Kong. C.Wuhan.