单项选择题

It's harmful to one's health to _______ smoking and drinking.

A．take on
B．take in
C．take to
D．take off
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单项选择题
The doctors ______ the medicines to the people in the flood area.
A．distributed
B．allotted
C．spread
D．scattered
单项选择题
The ______ of human knowledge are being pushed further.
A．boundaries
B．borders
C．limits
D．edges
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