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
In parts of the Arctic, the land grades into the landfast ice so ______ that you can walk off the coast and not know you are over the hidden se
A． permanentlyB. imperceptiblyC. irregularlyD. precariously
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