Nearly ___ of the surface of our planet is covered by water.

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Nearly ___ of the surface of our planet is covered by water.
老师给的答案为seven-tenths
但是分数的中间需不需要加连字符是one third还是one-third
如果不加连字符,如two thirds作定语加连字符后需不需要去s,变为two-third 就像 a five-year-old girl一样
请具体回答,

seven-tenths 和seven tenths 都可以.
当分子大于一时, 分母,序数词,后必须有s

再问： two thirds作定语和a five-year-old girl这种加连字符就去s的不同吗
再答：肯定不同 five-year-old 是合成形容词，直接接名词而分数，是指“整体:" 和部分”的关系，常接表范围的of.."在。。。。之中“
再问：所以two thirds作定语不能去s？
再答：这没因果关系记住这一条：当分子大于一时，分母（序数词）后必须有s

__ most of the earth's surface is covered by water,fresh wat 21.____ most of the earth’s surface is covered by water,fres ____ of the surface of the earth is covered with water.A.fir three quarters of the earth's surface is covered with water. About two thirds of the Earth's surface is covered by the se Nearly three-quarters of the earth's surface are covered wit As we all know,the earth is a planet almost covered by water How much of the earth is covered by water?什麼意思? 怎么hui daHow much of the Earth is covered by water? 1.Most of the earth ___ covered with water. About 70 per cent of the surface of the Earth is covered wit The surface of the Earth is about 70% water