单项选择题

We are told that adders are ______.

A．normally friendly towards people
B．unlikely to bite except in self-defence
C．aggressive towards anyone in their territory
D．not afraid of human beings

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单项选择题

It is clear from the passage that the author considers ______.

A．a sense of contribution to the product important
B．a sense of responsibility of the worker significant
C．a large number of production lines essential
D．a large number of workers highly necessary

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