设有如下程序: import java.util.*; public class Sun { public static void main(String args[ ]) { int score; String a; Random r=new Random(); score=r.nextInt(4)+5; switch(score) { case 0: a="E"; break; case 1: a="D"; break; case 2: a="C"; break; case 3: a="B"; break; default: a="A"; } System.out.println(A) ; } } 程序运行的结果是( )。A.a="A"B.aa"E" a="A"C.a="E"D.a="C"

设有如下程序: import java.util.*; public class Sun { public static void main(String args[ ]) { int score; String a; Random r=new Random(); score=r.nextInt(4)+5; switch(score) { case 0: a="E"; break; case 1: a="D"; break; case 2: a="C"; break; case 3: a="B"; break; default: a="A"; } System.out.println(A) ; } } 程序运行的结果是( )。

A.a="A"

B.aa"E" a="A"

C.a="E"

D.a="C"


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