Far-reaching as many of them [Edison’s inventions] have been in their effect upon modern civilization, the total effect of Edison’s career surpasses the sum of all of them.
A．One can never evaluate Edison’s great inventions high enough.
B．One needs to understand Edison’s inventions to appreciate his career.
C．Edison’s inventions are his most outstanding contributions to human life.
D．Edison’s influence upon human society is much greater than his inventions.