单项选择题

What's the main idea of the passage

A．American firms are different from Japanese and German firms in human-resource management.
B．Extensiving retraining is indispensable to effective human-resource management.
C．The head of human resource management must be in the central position in a firm's hierarchy.
D．The human resource management strategies of American firms will affect their competitive capacity.

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单项选择题

What does we have been 'twindling the knobs' for decades mean

A．We have been changing the climate with thoughtless actions for decades.
B．We have been handling machines with poor skills for decades.
C．We have been following a misleading chapter about the earth for decades.
D．We have been mistaken in the belief in developing the agricultural infrastructure.

单项选择题

Which of the following is NOT true according to the passage

A．The climate in recorded human history has generally remained stable.
B．The climate from about 135,000 to 115,000 years ago was in a extremely cold state.
C．The human race has been lucky to have enjoyed the most favorable period of climate for them to build a socio-economic system.
D．The evidences scientists collected from the ice cores suggest that a civilization can not have arisen in the period from about 135,000 to 115,000.