—Do you often see William  _____  on the playground?  

—No, but he is often seen ______Chinese Kongfu in the park.         [ ]

A. run, play    

B.  run, to play    

C.  running, play

比较分析法只适用于同质指标的对比，对比时要注意相比指标的可比性，即进行对比的各项指标，在经济内容、计算方法、计算期等方面应当可比。