______ I know, many thousands of tourists from the Mainland have been to Taiwan. [ ]

A. As soon as　　　

B. As well as　　 　 　

C. As much as　　　 　

D. As far as

在观看遥控航空模型飞行时要服从场地工作人员的安排，在安全线后观看。在无人看管的地方观看别人飞行时，一定要在遥控飞行员身后观看，有经验的遥控飞行员是不会将模型飞机飞到身后去的；对于那些满天乱飞的飞行员应该是对于模型飞机掌控能力较差，观看时应尽量靠近。