烧伤休克期补液时，调节补液量及速度的指标不包括

A．尿量

B．血pH和C0₂CP，红细胞比容

C．自觉症状，有无口干、烦躁

D．心率、血压、中心静脉压

E．末梢循环，甲床毛细血管充血反应

--- I wonder how much you charge for your service.

--- The first two are free ______ the third costs $30.

A．while

B．until

C．when

D．before