单项选择题

You can be sure that he is somewhat _____________.

A. in 30 years old
B. in the thirties
C. in thirty years
D. in the thirty
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单项选择题
An agreement has been nailed ______ recently by the partners of the company.
A. down
B. up
C. in

D. on
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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