单项选择题
The development of domestic tourism is a necessary （） for the development of outbound international travel.
A. formation B. foundation C. form D. fortune
单项选择题 TheWTOdefinesadomestictouristasatravelervisitingadestinationinhiscountryofresidenceforatleast（）.
单项选择题 Anyinfluxoftouristswillmakesomeimpactonaregion，butthecontentoftheimpactisdependentnotjustupon（）butonthe（）oftouristsaregionattracts.
