假设以描述大学生活为题写一个段落,请判断下列句子是否能够作为主题句来使用。 John is a boy. John is a new student at a vocational college. The cafeteria food doesn’t taste good. Attending college is a significant turning for many students. Lily studies English as her major and she does much social practice in her spare time. Why do you go to college?