Books are the most important records we keep　　 man’s thought,ideas and feelings.

A、up　　 B、to　　 C、of　　　　 D、on

Books are the most important records we ______ man’s thought, ideas and feelings .

1. A.
   keep up
2. B.
   keep of
3. C.
   keep down
4. D.
   keep on

Books are the most important records we ______ man’s thought, ideas and feelings .

A. keep up   B. keep of    C. keep down   D. keep on

Books are the most important records we ______ man’s thought, ideas and feelings .