单项选择题

And the following five fragments：

How many of the code fragments， inserted independently at line 12，compile？（）

A.0
B.1
C.2
D.3
E.4
F.5

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单项选择题

What is the result？（）

A.4321
B.0000
C.An exception is thrown at runtime.
D.Compilation fails because of an error in line 18.

单项选择题

What is the result？（）

A.hi hi
B.hi world
C.world world
D.Compilation fails.
E.An exception is thrown at runtime.

单项选择题

What is the result？（）

A.2
B.3
C.4
D.6
E.7
F.Compilation fails.