问题 选择题 已知集合A={2,4,5,7},B={3,4,5},则A∩B=( )A.{1,6}B.{4,5}C.{2,3,7}D.{2,3,4,5,7} 答案 由集合A={2,4,5,7},B={3,4,5},得A∩B={4,5}故选B.