【評論主題】【題組】2 Bill’s sister has to wash the dishes.(加入附加問句)
【評論內容】本題的機會成本：要生產一顆籃球會喪失掉生產機顆手球的情況 越低越好阿明：６／３＝2小花：６／１３＝0.462永倫：３／６＝0.5阿秀：１２／５＝2.4