单项选择题

Many hunting and gathering people of the late 20th century have recently adopted some form of organized agriculture to ______ their wild food resources.

A．compliment
B．implement
C．supply
D．supplement
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单项选择题
Please don't take ______ at what I'm saying.
A．defence
B．offence
C．declaration
D．obedience
单项选择题
His name was on the ______ of my tongue, but I just couldn't remember it.
A．point
B．edge
C．tip
D．top
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