(IP 
  (NP-SBJ 
    (-NONE- *PRO*))
                    
  (VP 
    (PP-LOC 
      (P 沿)
                    
      (NP 
        (NP 
          (NN 市区))
                    
        (ADJP 
          (JJ 主要))
                    
        (NP 
          (NN 干线))))
                    
    (VP 
      (VV 巡游)
                    
      (QP-EXT 
        (CD 一)
                    
        (CLP 
          (M 周))))))
arg0: 
                    *PRO* 
                
argm: 
                    一 周 
                
argm: 
                    沿 市区 主要 干线