判断循环血量最可靠的是（）。

A.尿量及比重

B.脉压

C.脉搏

D.中心静脉压

E.病史

It’s reported that a light rail from Nanjing to Lishui        by the end of 2015.

A．has been completed

B．is completed

C．was completed

D．will be completed