The reading scores of American 15-year-olds have fallen sharply since 2022 and are near their lowest point in 25 years, according to the results of a key global exam released on Tuesday. 周二公布的一项关键全球测试结果显示，美国15岁学生的阅读成绩自2022年以来大幅下滑，已接近25年来的最低水平。 U.S. math scores…