题目内容：
Unpopular Subjects? Is there a place in today’s society for the study of useless subjects in our universities? Just over 100 years ago Fitzgerald argued in a well-written letter_____（51）Nature that “Universities must be allowed to study useless subjects _____（52）they don’t，who will?He went 0n to use the _____（53）of Maxwell’s electrodynamics_（电动力学）as one case where a“useless subject” has been transformed to a useful subject． Nowadays this argument is again very much _____（54）in many universities．Indeed one suspects that it is one of those arguments that must be _____（55）anew（重新）by each generation．But now there is an added twist ~）--subjects must not only be useful，they must also be _____（56）enough that students will flock（蜂拥）to d0 them，and even flock to pay to do them．
As universities become commercial operations，the pressure to_____（57）subjects or departments that are less popular will become stronger and stronger, Perhaps this is most strongly_____（58）at the moment by physics．There has been much_____（59）in the press of universities that are closing down physics departments and incorporate them with mathematics or engineering departments．
Many scientists think otherwise．They see physics as a_____（60）science，which must be kept alive if only to_____（61）a base for other sciences and engineering．It is of their great personal concern that physics teaching and research is under _____（62）in many universities．How Can it be preserved in the rush towards commercial competition? A major turnaround（转变）in student popularity may have to_____（63）until the industrial world discovers that it needs physicists and starts paying them well．Physics is now not only unpopular；it is also“hard”．We can do more about the latter by_____（64）teaching in our schools and universities．We can also_____（65） cooperative arrangements to ensure that physicists keep their research and teaching up to date. A．about
B．of
C．to
D．on
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