a. He must be very old. Look，he has grey ________.

b. He found some ________ in his soup.

A. hair，hair B. hairs，hairs C. hair，hairs D. hairs，hair

此題應選 C，容易誤選 A，誤認為hair永遠不可數。其實hair這個詞既可以是可數名詞，也可以是不可數名詞，只是含義稍有變化：

1. 作為可數名詞，是指一根一根的“頭發”或“毛發”：

Look at this, a hair in my soup. 你瞧，我的湯里有根頭發。

The cat has left her loose hairs all over my clothes. 貓掉的毛弄得我衣服上到處都是。

My father has quite a few gray hairs. 我父親已有不少白發。

There is not a gray hair on his head. 他頭上沒有一根白頭發。

2. 作為不可數名詞“頭發”的總稱，是集合名詞：

I’ll have my hair cut. 我要去理發。

He has blond hair. 他有一頭金發。

She has a beautiful head of hair. 她有一頭漂亮的頭發。

The woman likes to do her hair in foreign style. 這個女人喜歡把頭發梳成外國式。

試比較以下句子：

He has grey hair. 他滿頭白發。

He has grey hairs. 他有些白發了。