— OK, I've had enough of it. I give up.

— You can't _______your responsibilities. [ ]

A. run off with      

B. run up against      

C. run out of      

D. run away from

反射式折射仪测定折射率的原理是：（）.

A.反射率换算成折射率

B.用折射角、入射角计算

C.全反射原理