题目

的分数单位是（______），它有（______）个这样的分数单位。再加上（______）分数单位是最小的质数。 答案：【答案】 11 15 【解析】求一个分数的分数单位，看分母，分母是几，分数单位就是几分之一；求分数有几个分数单位，看分子，分子是几，就有几个分数单位；最小的质数是2，用2减去，由此求解。的分数单位是，它有11个这样的分数单位；最小质数是2，2－＝，故再加上15个分数单位是最小的质数。故【1】On my way home, I saw a little girl ______ (cry) at the corner.【2】It was sunny and hot yesterday. We went to the park and ______ (fly) kites there.【3】He went ______ (camp) with his friends on Saturday morning.【4】Two days ago, Nancy ______ (tell) me an interesting story.【5】There ______ (be not) any butterflies in the countryside three years ago.