单项选择题
What is the result？（）
A.Afoo，Afoo B.Afoo，Bfoo C.Bfoo，Afoo D.Bfoo，Bfoo E.Compilation fails. F.An exception is thrown at runtime.
多项选择题 Which three statements are true？（）
单项选择题 What is the result？（）
