【多选题】

The passage discusses the gap between teachers and students. Summarize the problems by putting the following statements according to the sequence they appear in the passage.

A、Lectures are often very formal and empty.
B、Most of knowledge comes from classrooms or laboratories.
C、Undergraduates are not touched with personal influence of teachers.
D、The life of undergraduates is almost disassociated from intellectual interests.
E、Men are always made thoughtful by books.
F. Men are generally thoughtful by association with men who think.