相关考题
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                                    单项选择题
                                    
 What is the result?()
 A.2-1 
 B.2-4
 C.2-5
 D.3-1
 E.3-4
 F.3-5
 G.Compilation fails.
 H.An exception is thrown at runtime.
- 
                                    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].
- 
                                    单项选择题
                                    
 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.
 
             
            
 
                
            