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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Many people believe that our species ______ threatened with extinction. IA] is [BI are [C] are to be [D]used to be
Many people believe that our species ______ threatened with extinction. IA] is [BI are [C] are to be [D]used to be
单项选择题
According to American federal government, residents of Hawaii have the longest life ______: 77.2 years.
A．rank
B．scale
C．span
D．scope
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