1.Here are the results of the student activity survey at Green High School.2.My teather asked me to do a survey of student activities.这两句里的activity 为什么一个是复数,一个用的单数?student为什么都用的单数?

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1.Here are the results of the student activity survey at Green High School.2.My teather asked me to do a survey of student activities.这两句里的activity 为什么一个是复数,一个用的单数?student为什么都用的单数?

1.Here are the results of the student activity survey at Green High School.2.My teather asked me to do a survey of student activities.这两句里的activity 为什么一个是复数,一个用的单数?student为什么都用的单数?
1.Here are the results of the student activity survey at Green High School.
2.My teather asked me to do a survey of student activities.
这两句里的activity 为什么一个是复数,一个用的单数?
student为什么都用的单数?

1.Here are the results of the student activity survey at Green High School.2.My teather asked me to do a survey of student activities.这两句里的activity 为什么一个是复数,一个用的单数?student为什么都用的单数?
第一个是特指那一次活动
第二句是一个泛指 (泛指学生活动类的)
student 名词作定语要用单数