单项选择题

What is the result？（）

A.Compilation fails.
B.An exception is thrown at runtime.
C.The variable first is set to null.
D.The variable first is set to elements[0].

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单项选择题

A.1
B.2
C.12
D.Compilation fails.
E.No output is produced.
F.An exception is thrown at runtime.

单项选择题

What is the result？（）

A.2
B.24
C.234
D.246
E.2346
F.Compilation fails.

单项选择题

What is the result？（）

A.23
B.234
C.235
D.2345
E.2357
F.Compilation fails.