(IP 
  (IP-CND 
    (NP-SBJ 
      (-NONE- *PRO*))
                    
    (VP 
      (ADVP 
        (CS 若))
                    
      (VP 
        (VC 是)
                    
        (VP 
          (PP-TMP 
            (P 临)
                    
            (NP 
              (NN 老)))
                    
          (ADVP 
            (AD 才))
                    
          (VP 
            (VV 开始)
                    
            (VP 
              (VV 运动)))))))
                    
  (PU ，)
                    
  (NP-SBJ 
    (-NONE- *pro*))
                    
  (VP 
    (ADVP 
      (AD 最好))
                    
    (ADVP 
      (AD 还是))
                    
    (VP 
      (VV 选择)
                    
      (NP-OBJ 
        (IP-APP 
          (NP-SBJ 
            (-NONE- *PRO*))
                    
          (VP 
            (VP 
              (VV 游泳))
                    
            (PU 、)
                    
            (VP 
              (ADVP 
                (AD 快步))
                    
              (VP 
                (VV 走)))
                    
            (PU 、)
                    
            (VP 
              (VV 踩)
                    
              (NP-OBJ 
                (ADJP 
                  (JJ 固定式))
                    
                (NP 
                  (NN 脚踏车))))
                    
            (ETC 等)))
                    
        (NP 
          (NN 方式))))))
arg0: 
                    *PRO*