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单项选择题 Given the following code：     public class Person{     int arr[] = new int[10]；  public static void main（String a[]） {     System.out.println（arr[1]）；     }     }  Which statement is correct？（） 

A、 When compilation some error will occur.

B、 It is correct when compilation but will cause error when running.

C、 The output is zero.

D、 The output is null.

  • A

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