单项选择题

The word "versatile" (Line 4, Para. 3) most probably means______.

A．useful and changeable
B．adaptable and flexible
C．flexible and useful
D．adaptable and changeable
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单项选择题
According to the passage, human beings can better adapt to their environment than animals by______.
A．passing directly and efficiently words of warning from one generation to the next
B．means of the natural selection
C．evolution
D．using language
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