The most important advances made by man come from ______.

A．allows the human race to progress technically
B．comprises both the physical and social sciences
C．demonstrates human adaptability
D．defines his essential humanity

A．both social and natural sciences are aimed at understanding only
B．both pure knowledge and its applications are equally essential to man
C．philosophy is totally independent of the sciences referred to in the text
D．the revolutionary results of pure science can hardly be imagined by Utopians