5,300 children.
题意:
在“世界希望之旅”中,“微笑行动”帮助了多少孩子?
根据第二段Over the years,Operation Smile has won many prizes for its work and in 1999 they even started a special event called“The World Journey of Hope'". 5,300 children in18 countries were operated on successfully during the event.多年来,微笑行动赢得了许多奖项,1999年,他们甚至开始了一个名为“世界希望之旅”的特别活动。 活动期间,来自18个国家的5300名儿童成功接受了手术。可知,在“世界希望之旅”中,“微笑行动”帮助了5300个孩子。