如图所示，电阻R₁、R₂串联在12 V的电路中，R₁=6 k Ω，R₂=3k Ω。当用电阻不是远大于R₁和R₂的电压表0～3 V量程测量R₂两端的电压时，电压表的读数是3V。当用该电压表0～15 V量程测量R₁两端的电压时，电压表的读数为  

A．9V   

B．7.5 V    

C．8 V    

D．6 V

You say he works very hard, _____ and ______.

A．so does he, so do you

B．so does he, so you do

C．so he does, so do you

D．so he does, so you do