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itiesyoumakeupfor【要点综述】本文为一篇说明文。在我们的生活中，无论是对金钱还是时间而言，我们都需要一直寻找更好的机会。本文从经济学的角度诠释了这些概念。58．D细节理解题。根据第一段第二句“Eco
omicsdealswiththisproblemthroughtheco
ceptofopportu
itycostwhichsimplyreferstowhethersomeo
estimeormo
eycouldbebetterspe
to
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gelse”可知机会成本，简单指某人的时间或者金钱是否可以被更好地用在其他方面，即权衡机会的选择，故D项正确。59．C细节理解题。根据第三段内容可知“leftovertime”是指上文中提到的去体育场往返路上的时间，C项是同义句，故选C。60．B推理判断题。根据题干中的关键词forgo
e可以定位到本文第四段。根据第四段第一句“everydecisio
ismadebyk
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emustforgo”及最后一句的“stillcostsyousomethi
gi
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