21.A细节理解题。根据第二段We've ensured the route is safe,and most of the route is on quiet roads with littletraffic.可知,旅游组织者特别关注了路线安全问题。22.B细节理解题。根据第三段The port of Nice,Mont Boron,Mont Alban and Villefranche(in the half day tour)及下文信息可知,游客会爬Mont Boron,会参观medieval fortress of Mont Alban,中午在地中海沿岸的Villefranche-sur-Mer午餐;又根据We play this game under the Mediterranean pine trees until the end of the tour.及starting time:l0am和7 relaxing and fun hours可知,玩Petanque游戏应在下午进行。23.C细节理解题。根据文章最后一段Only120€if you book the tour online in advance!可知,网上购票l20€,提前网上购票两张应付240€。