[解析]
(1)细节理解题。根据第一段It will take place on the River Seine.(它将在塞纳河上举行。)可知,2024年巴黎奥运会的开幕式将在塞纳河上举行。故选B。
(2)词义猜测题。根据第三段That is to say,it is not only the nature of sporting events,but also social and cultural activities.(也就是说,这不仅是体育赛事的本质,也是社会和文化活动的本质。)可知,开幕式是体育和文化的融合,combination的意思是"融合"。故选D。
(3)细节理解题。根据第二段More than 160 boats will be filled with the players from more than 200 countries.(160多只船将满载来自200多个国家的运动员。)可知,参赛的国家有200多个,选项A错误;根据倒数第二段Part of the public will buy tickets to sit along the River Seine,while the rest are able to take part in the ceremony for free.(一部分公众将购买塞纳河沿岸的门票,而其他人则可以免费参加开幕式。)可知,不是所有人都需要买票,选项C错误;根据最后一段For the first time in the history of the Games,we're going to organize a ceremony in the middle of the city,on the River Seine.(在奥运会历史上,我们将首次在市中心塞纳河畔组织一场开幕式。)可知,是首次在塞纳河上举行开幕式,巴黎不是首次举办奥运会,选项D错误;根据最后一段Estanguet was proud of this idea (Estanguet为他 的想法感到自豪),可知选项B正确。故选B。