背景:每个班只有8个人,so their instructor really gets to know them well.
听力原文:then the instructors themselves are in blue shirts,and one of these is responsible for each class.
是说所有的instructors(各自负责自己班)中,有一个人是总负责every class的? 还是one of these也能=each of these,表示每个instructor负责各自班级?