单项选择题

It comes as no surprise that societies have codes of behavior. The character of the codes, on the other hand, can often be ______.

A．predictable
B．unexpected
C．explicit
D．confusing
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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
单项选择题
According to legend, Daniel Webster made a ______ with Satan, but managed to talk his way out of it at the last moment.
A．economy
B．standard
C．van
D．compact
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