单项选择题

Human beings have ______ themselves to very diverse environments with the help of fire, agriculture and machines.

A．adapted
B．addicted
C．adopted
D．adhered
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单项选择题
A．the lowerB．the higherC．differentD．various
A．the lower
B．the higher
C．different
D．various
单项选择题
A．WhenB．SinceC．WhetherD．Although
A．When
B．Since
C．Whether
D．Although
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