網課確實效果差
https://www.wsj.com/articles/student-test-scores-drop-in-math-since-covid-19-pandemic-11605974400?mod=searchresults_pos1&page=1
American children started school this fall significantly behind expectations in math, and modestly behind in some grades in reading, according to one of the first reports on widely used tests since the coronavirus pandemic shut schools in March.