题目

       A person who compares the annual earnings of college and high school graduates would no doubt conclude that higher education is a good investment—the present value of the college earnings premium (奖金) (the better part of $1 million) seemingly far outdistances (超过) college costs. But for many, attending college is unequivocally (明确地) not the right decision on purely economic reasons. First of all, college graduates on average are smarter and have better work habits than high school graduates. Those who graduated from college were better students in high school1.大冠买了一包宣纸练习书法,每星期一写1张,每星期二写2张,每星期三写3张,每星期四写4张,每星期五写5张,每星期六写6张,每星期日写7张.若大冠从某年的5月1日开始练习,到5月30日练习完后累积写完的宣纸总数已超过120张,则5月30日可能为星期几?请求出所有可能的答案并完整说明理由.
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