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

题目

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

答案

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 ha...