[单项选择]

Text
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 University of Pittsburgh set themselves the (28) problem how to collect body heat. They have designed a collection system which utilizes (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 building, theatres and offices (33) classrooms -- are more than amply 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 modem buildings recover (37) , but the university’s system is the first to recove
A. hard 
B. hardest 
C. harder 
D. more hard

[单项选择] Every human being, no matter what he is doing, gives off body heat. The usual problem is how to dispose of it. But the designers of the Johnstown campus of the University of Pittsburgh set themselves about the 51 problem ------how to collect body heat. They have designed a collection system which utilizes not only body heat, but the heat given off by such objects as light bulbs and refrigerators as well. The system works so well 52 no conventional fuel is needed to make the campus’ six buildings comfortable. 　　Some parts of the buildings ------ theatres and offices 53 classrooms ------ are more than amply heated by people and lights and sometimes must be air-conditioned 54 in winter. The technique of 55 heat and redistributing it is 56 “Heat recovery”. A few modern buildings recover __57__, but the university’s system is the first to recover heat 58 some buildings and reuse it in 59 . Along the way, Pitt has learned a great deal about some of its heat producers. The 60 a studen
A. saving
B. being saved
C. disposing
D. being disposed