单项选择题

class BitStuff {  
BitStuff go() { System.out.print("bits "); return this; }  
}  
class MoreBits extends BitStuff {  
MoreBits go() { System.out.print("more "); return this; }  
public static void main(String [] args) {  
BitStuff [] bs = {new BitStuff(), new MoreBits()};  
for( BitStuff b : bs)  
b.go();  
}  
}  
结果为:()  

A.bits bits
B.bits more
C.more more
D.编译失败

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