Books are the most records we keep _______ man’s thoughts , ideas and feelings .

A.    on                  B．up                   C．of                   D．for

 Books are the most records we keep ______ man’s thoughts, ideas and feelings.

       A. on                          B. up                          C. of                          D. for

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

       A．on                      B．up                       C．of                      D．for

Books are the most important records we keep________man’s thoughts, ideas and feelings.

A.up        B.of                C.for           D.on