A．language is unique to man.
B．man is a tool-maker.
C．man is characteristic of the possession of vocal equipment.
D．man has remarkable level of activity and creativity.
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A．what history is.
B．the difference between human beings and animals.
C．what point should be the beginning of the human history.
D．how the human beings make their history.
A．When we are sure about what we are looking for, we will understand the whole human history.
B．No other culture is advancing as the human culture.
C．As long as the group forms a culture, they may have history,.
D．It will be impossible to find the beginning of the human history.
A．lack of interest in others.
B．self-centeredness.
C．unintelligence.
D．lack of social feeling.