对中心静脉压影响最小的是（）。

A.静脉回心血量

B.静脉血管张力

C.肺动脉楔压

D.血容量

E.右心室排血能力

The disappearance of dinosaurs made _______ the evolution and dominance of mammals on the earth.

A．it was possible

B．it possible

C．possible to be

D．possible