毕业总复习期间，在《量的计量》复习课的课尾，我习惯性地问道：“谁还有问题?”一位学生发问：“老师，我想知道一亩地有多大?”询问后才知，她在家无意中翻到了一本《江苏省农民负担监督卡》，上面有这样的内容：土地承包面积0.73亩，每年上缴农业税40元。这一问题使我联想 During my graduation review, at the end of the “metrological” review class, I habitually asked: “Who else has problems?” One student asked, “Teacher, I want to know how big an acre is?” After that, she inadvertently turned her home to a “supervise card of peasants in Jiangsu Province,” which has the following contents: The land contracting area is 0.73 mu and the agricultural tax is turned over 40 yuan a year. This question reminds me