单项选择题

Compared mathematically to smoking and driving, almost everything else seems relatively risk-free, ______ almost nothing seems worth regulation.

A．yet
B．since
C．so
D．even though
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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
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
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