anHeaskedhisstudents的精选

问题详情：  Mr.GuoisateacherfromXi’an.HeaskedhisstudentstohandintheirhomeworkthroughaQRcode（二维码）.“Wespentanhourortwoinclasslearninghowtogenerate（使产生）thecodes,andintheendeverythinggetseasier.”Said...