頭發是可數名詞還是不可數名詞

　　What a difference! You look great with your hair like that.

　　真是判若兩人！你梳這種發型顯得太帥了。

　　Did she use to have long hair?

　　她過去留長發嗎？

　　Mary's red hair always made her conspicuous at school.

　　瑪麗的紅頭發在學校里總是很惹眼。

　　Did you see the length of his hair?

　　你看見他頭發有多長嗎？

　　Your hair could do with a cut.

　　你該理發了。