单项选择题

Although economists have traditionally considered the district to be solely an agricultural one, the ______ of the inhabitants' occupations makes such a classification obsolete.

A．productivity
B．diversity
C．predictability
D．stability
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单项选择题
The modern age is a permissive one in which things can be said explicitly, but the old traditon of ______ dies hard.
A．talkativeness
B．exaggeration
C．condemnation
D．euphemism
单项选择题
The presence of armed guards ______ us from doing anything disruptive.
A．defeated
B．irritated
C．prevented
D．encouraged
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