（） will be key operating factors in managing a successful domestic travel service.

单项选择题Weshould（）oureconomicpolicyofdevelopingtourism.

A. present to          
B. preside to          
C. persist in            
D. practice in

单项选择题Thosewhosaytheytravel“toescape”or“torelievetension”canbeseenasseekingtosatisfy（）.

A. one’s esteem need                      
B. one’s intellectual need    
C. one’s safety need                       
D. one’s physiological need