多项选择题

What are four valid examples of polymorphic method calls？（）

A.x.a2（）；
B.z.a2（）；
C.z.c1（）；
D.z.a1（）；
E.y.c1（）；
F.x.a1（）；

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单项选择题

What is the result？（）

A.peep
B.bark
C.meow
D.Compilation fails.
E.An exception is thrown at runtime.

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？（）

A.Compilation fails.
B.The code compiles and the output is 2.
C.If lines 16， 17 and 18 were removed， compilation would fail.
D.If lines 24， 25 and 26 were removed， compilation would fail.
E.If lines 16， 17 and 18 were removed， the code would compile and the output would be 2.
F.If lines 24， 25 and 26 were removed， the code would compile and the output would be 1.