冠状动脉右优势型是指（）。

A.窦房结的60%来源于右冠状动脉，40%来源于左回旋支

B.房室结的98%来源于右冠状动脉，2%来源于左回旋支

C.左室的后降支和后支均来源于左回旋支

D.左室的后降支来源于右冠状动脉，左室后支来源于左回旋支

E.左室的后降支和后支均来源于右冠状动脉

---I will not come here tomorrow.

--- _____________to me, because I don’t care.

A．It doesn’t make any difference

B．It makes much difference

C．It doesn’t make no difference

D．It makes a difference