( )是现代旅游三大板块的核心。
A. 旅行社
B. 旅游饭店
C. 旅游交通
D. 旅游景点
The ________ ( 聚集在一起的)crowd assumed Cliff was there to observe the race..
The _______( 比赛;竞赛) takes up to seven days to complete and is a challenging test and fitness and strength even for world-class athletes who compete for distinction and a cash prize.
No one paid any attention to this odd-looking man who might as well have been __________(看不见的)