    sarah             sarah 
            
           
 
                                                                                                                                 
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                                                       (         3-4    )                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
                  2. 
                                                                                                                         A,B,C,D                                                                                                                                                                                                                            (      )                                                                                                                                                                                                                                
                                                                                                                                                                                                              ***                                                                                                                                                                                                                                                                                 (         )                                                                                                                           
                     3 
                                                                                                                                                           (                 )                                                                                  ( )                                                                    
                                                           sarah                                                              (         )                                                                                                                                                                                                                                                                                                                                                                                           
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           (                   )                                                                                                           
                                                                                                                                                                                                                                                            (       )                                                                                  
                                                                                                                    -     -                                                  (          )                              
                   
              