单项选择题

Varied jobs, in writer's opinion, will ______.

A．offer greater productivity
B．drive workers to work harder
C．make workers more productive
D．make worker's life more enjoyable, but do not make them more hardworking

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热门试题

单项选择题

The writer implies that ______.

A．sleep is important for good mental and physical health
B．a light sleep is as restful as a deep sleep
C．memory is improved during sleep
D．sleep is relatively unimportant for human beings

单项选择题

The longest time a human being can survive without sleep is probably ______.

A．five days
B．seven days
C．ten days
D．twelve days