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Two _____(five) of the students in our class are boys.1.填什么

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Two _____(five) of the students in our class are boys.1.填什么 2.原因.3.能否填入“by five”?
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填 fifths分数、小数和百分数的读法
分数
表示分数时,分子要用基数词,分母用序数词.如果分子大于1,分母必须用复数形式:
1/3→a(one)third
2/3→two thirds w
1/4→a(one)quarter(或fourth)
3/7→three sevenths t
1/2→应读作a(one)half
*比较复杂的分数如:24/789,多读作 twenty four over seven hundred and eighty nine.