多项选择题
Which two classes correctly implement both the java.lang.Runnable and the java.lang.Cloneable interfaces？（）
A.A B.B C.C D.D E.E
单项选择题 Which statement is true about the class of an object that can reference the variable base？（）
单项选择题 What is the result？（）
多项选择题 Which three are valid on line 12？（）
