[单项选择]"There is evil in every human heart, which may remain latent, perhaps, through the whole life; but circumstances may rouse it to activity.", which author of the following authors does the mention belong to
A. Washington Irving.
B. Ralph Waldo Emerson.
C. Nathaniel Hawthorne.
D. Walt Whitman.

Every human has a very unique arrangement of the skin on his finger and this arrangement is unchangeable. Scientists and experts have proved the uniqueness (独特性) of fingerprints and discovered that no exactly similar pattern (式样) is passed on from parents to children, though nobody knows why this is the case.
The ridge (脊状) structure on a person’s lingers does not change with the growth and is not affected by superficial (表面的) injuries. Burns, cuts and other damage to tile outer part of the skin will be replaced in time by the new one which bears a reproduction (再现) of the original pattern. It is when the inner skin is injured that tile arrangement will be destroyed. Stone criminals make use of tilts fact to remove their own fingerprints but this is a dangerous and rare step to take.
Fingerprints call be made very easily with printer’s ink. They can be recorded easily. With special methods, identification can be achieved successfully within a short tim
A. a person’s fingerprints are similar to his father’s
B. a criminal can change his fingerprints by injuring the outer skin
C. a person’s fingerprints are passed on from his parents
D. a criminal can change his fingerprints by damaging the inner skin

Passage one
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 the opposite problem of 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 that no conventional fuel is needed to make the campus's six buildings comfortable. Some parts of most modern buildings-theatres and offices as well as classrooms-are more than amply heated by people and lights and sometimes must be air-condition even in winter. The technique of saving heat and redistributing it is called “heat recovery”. A few modem building recover heat but the University’s system is the first to recover heat from some buildings and re-use it in others.
Along the way, Pitt
A. was difficult to collect
B. came in a variety of forms
C. was difficult to get rid of
D. tended to be absorbed by physical objects