[A] The telephone has helped to save people from illness and fire.
B. The telephone has helped to prevent wars and conflicts.
C. The telephone has made the modern oily neither better nor worse . [D) The telephone has had positive as well as negative effects on US.

A．automation will eventually prevent unemployment
B．automation will help workers acquire new skills
C．automation will eventually benefit the workers no less than the employers
D．automation is a trend which cannot be stopped