单项选择题
Degree of the worker's contribution is greater when ______.
A．a factory possesses more experts
B．a factory has many small production lines
C．workers enjoy more freedom
D．workers work at a large production line
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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
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单项选择题
The amount of sleep required may, ______.
A．vary greatly from one individual to another
B．depend on an individual's age
C．be related to an individual's occupation
D．All of the above
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