【单选题】

Every human being, (26) what he is doing, gives off body heat. The usual problem is (27) dispose of it.But the designers of the Johnstown campus of the University of Pittsburgh set themselves the (28) problem how to collect body heat. They have designed a collection system which utilize (29) body heat, but the heat given off by such objects (30) light bulbs and refrigerators as well. The system works so well (31) no conventional fuel is needed (32) the campus’s six buildings comfortable.

Some parts of most modern buildings, theatres and offices (33) classrooms are more than heated by people and lights and sometimes must be air-conditioned and (34) in winter. The technique of (35) heat and redistributing it is (36) "heat recovery".A、few modern buildings recover (37) , but the university’s system is the first to recover heat (38) some buildings and reuse it in (39) .Along the way, Pitt has learned a great deal about some of its heat producers. The (40) a student studies, the more heat his body (41) . Male students emit more than (42) students, and the larger a student, the more heat his body (43) . It is tempting to (44) that the hottest prospect for the Johnstown campus would be a (45) overweight male genius.
A．saving
B．being saved
C．disposing
D．disposed