_________ to a lot of new ideas when studying in college, Mary always does something that others can’t understand to realize her dream.

A．Exposing

B．Exposed

C．Being exposed

D．Having exposed

若导体两端加8V 电压时，1min 内通过导体横截面积的电量是18C ，导体中的电流是      A ，导体的电阻是      Ω；若导体两端不加电压时，导体的电阻为    Ω，通过导体的电流是       A 。