- 问题详情:Sarahlivedonafarmwithherfamily.Shewas___21___tolearntotrack,toidentifyeachpersonandwheretheyweregoingbythemarkstheyleftontheground.Andifherfathercouldn’tteachher,she’dteachherself.Tothe___22___ofherfamily,sheborrowedalltheir___23___andtaugh...
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