We may infer from the third paragraph that geography and climate play an important role in determining the inhabitants'______.

A．Many outstanding men want to see whether machines can judge and think.
B．There are already in existence some computers that can understand logic.
C．Dr. J. Von Neumann proved that some computers are complicated enough to reproduce themselves.
D．Human brain is too complex and complicated to be copied with the present level of technology.

A．science has proved that reproductive monster machines are already existing in the world
B．science has proved that the authors mentioned above tend to go to extremes
C．science has not completely denied the possibility of reproductive powers of machines
D．science is trying to prove the existence of reproductive monsters in the world