单项选择题

What is the key issue the author discusses in this passage

A．How to make workers enjoy life better.
B．How to make workers work shorter hours.
C．How to make workers more productive.
D．How to make jobs more interesting to workers.

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单项选择题According to the author, varied jobs ______.

A．make workers more productive
B．make the worker's life more enjoyable
C．make workers work much harder
D．make things much easier for workers

单项选择题Different from the first group of experts, other experts believe that ______.

A．jobs should be made more interesting
B．factories should have more complicated machinery
C．workers' wages must be sufficiently increased
D．workers should be given the freedom to do jobs in their way