阿灵顿镇的一家超市、一家百货商店和一家银行每个星期中只有一天全都开门营业。①这三家单位每个星期各开门营业4天。②星期日这三家单位都关门休息。③没有一家单位连续3天开门营业。④在连续的6天中:第一天,百货商店关门休息;第二天,超市关门休息;第三天,银行关门休息; Arlington’s supermarket, a department store and a bank are open only one day each week. ① The three units open their doors every week for 4 days. ② The three units are closed on Sundays to rest. ③ No one unit open for business for 3 consecutive days. ④ in a row for 6 days: the first day, department stores closed to rest; the next day, the supermarket closed to rest; the third day, the bank closed to rest;