看看下面的英文有无明显错误.

题目

看看下面的英文有无明显错误.
On the morning of April 29,2007,from 10:00 to 11:00,hundreds of millions of
students from primary,middle schools and universities all over China joined
in a national student sports program.Eleven million students in iangsu took
an active part in this program..
April 29,2007 kicked off a new national initiative to promote sports in
China.For one hour,from 10:00 to 11:00,hundreds of millions of students of
all ages joined in a national student sports program.In iangsu
province,eleven million students eagerly participated.

答案

I think you should add a "school" after primary....hundreds of millions of students from primary schools,middle schools,and universities..It's not required but in English it sounds better if you do so...