2017建筑新材料新技术:Who is the American top singer?(谁是美国最红的歌星？）

Who is the American top singer?(谁是美国最红的歌星？） who is the best man Who is the best actor? who is the first to .... who is the chinese communist? who is the richest around the world? Who is the Secretary of the State? who is the chairman of China Who is the hero in China nowdays? Who is the captain of Italy ?