Here are the results of the student activity survey at Green High School.

问题描述:

Here are the results of the student activity survey at Green High School.
这句话的activity为什么不加s复数?

名词做定语,用单数, 例如 shoe factorybook storetomato noodles
单数有几个特例,sports 作定语 sports meeting
clothes 做定语clothes shop
还有man, woman 作定语,修饰单数用单数,修饰复数用复数 a man teacher ,two women doctors