Those successful deaf dancers think that dancing is an activity __________ sight matters more than hearing.

A．when

B．whose

C．which

D．where

某商贩7年共偷税、漏税13万元，被公安机关依法逮捕。此案例说明( )。

A．纳税义务具有强制性

B．只有商贩才须纳税

C．公民的权利义务由公安部门规定

D．权利义务不具有一致性