A) follow C) join
B) combine D) mix

A．they teach logic to the readers
B．they show a sense of satire
C．they proved that machines can reproduce themselves
D．they described the imaginary future world of machines

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