单项选择题
Which Man class properly represents the relationship "Man has a best friend who is a Dog"？（）
A.class Man extends Dog{} B.class Man implements Dog{} C.class Man{private BestFriend dog；} D.class Man{private Dog bestFriend；} E.class Man{private Dog；} F.class Man{private BestFriend；}
多项选择题 Which two， independently， will allow Sub to compile？（）
多项选择题 Which five methods，inserted independently at line 5，will compile？（）
单项选择题 What is the result？（）
