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單項(xiàng)選擇題

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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單項(xiàng)選擇題

What is the result？（）

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

單項(xiàng)選擇題

What is the result？（）

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

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