The title of professor should be given only to those who, first and foremost, do ______.

A．Distinguished professors at research universities should concentrate on research only.
B．The separation of teaching from research can lower the quality of future scientists.
C．It is of utmost importance to improve teaching in elementary schools in order to train new scientists.
D．The rapid development of modem science makes it impossible to combine teaching with re search.

A．raising the status of teaching with research
B．the combination of teaching with research
C．the separation of teaching from research
D．improving the status of research