Headache is a kind of ______(disease).這個空應該填disease(單數)還是dis

題目：

Headache is a kind of ______(disease).這個空應該填disease(單數)還是diseases（複數）形式?
RT.是a kind of名詞單數還是名詞複數?

解答：

Headache is a kind of disease.用單數.表示一種事物,無需用複數.