Young people have black____(hair) and old people have white_

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Young people have black____(hair) and old people have white___(one,ones)

Hair is both singular and plural.The hair on your head refers to all the individual hairs.头发可以是单数和复数,用hair就可以代表你头发上所有的头发~
The plural for countable hair is hairs.One hair,two hairs...hair头发本身是有可数的~可以加s
But a collection of hair is hair.不过以整体来说习惯用hair
一般是通用(比如我们说脸上的毛可以facial hair/hairs)
这里用hair one

Young people usually have more e________ than old people . Young people have different 【thoughts】 from the old people. nowadays a lot of young people like to have their hair _____ 单句改错。1. Young people usually have more energies than the old All people,they are old or young,rich or poor,have been tryi All people,___ they are old or young,rich or poor,have been Young people usually have _____ than the old .填more energy为什 Should young people have a naked wedding? How do young people have their birthday, if 55 percent of a group of people have brown hair and 80 pe "the gap between young people and the old generation today" 一个英语阅读的答案Young people have many dreams.Here are Lei Ping and