下列关于体外循环的说法，哪项是正确的（）

A.静推肝素2～3mg／kg体重进行肝素化

B.采用HCT为20％～25％的中度血液稀释转流

C.并体循环期间通过变温器改变血液温度，降低或升高机体温度

D.转流结束后用血精蛋白终止肝素抗凝作用

E.以上都正确

He must be _________ home now.

A．on his way to

B．on his way

C．in his ways to the

D．in his way