[概括大意]“Many of life‘s failures，” the supreme innovator said， “are people who did not realize how close they were to success when they gave up.” Before that magical moment in October 1879， Edison had worked out no fewer than 3，000 theories about electric light， but in only two cases did his experiments work.
The main idea of this paragraph is__________.
A.Importance of learning from failure
B.Never a successful man gives up
C.It is important to fail for a successful man
D.Edison‘S comment on failure