单项选择题

According to the passage, it is the telephone that______.

A．has made letter writing an art
B．has prevented wars by avoiding written communication
C．has made the world different from what it was
D．has caused wars by magnifying and extending human conflicts

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单项选择题

Though labor worries about the effects of automation, it never doubts that______.

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

单项选择题

21 In order to get the fall benefits of automation, labor will depend mostly on

A．additional payment to the permanently dismissed workers
B．the increase of wages in proportion to the increase in productivity
C．shorter working hours and more leisure time
D．strong drive for planning new installations