有关通气储备，下列哪项是正确的（）

A.通气储备<86%为通气功能不佳

B.通气储备<70%为通气功能严重受损

C.临床上主要用于估价通气储备

D.有严重心肺疾患者不宜进行此项检查

E.A～D

---Whose watch is this? Is it __________?

---No, it’s not __________watch. It’s __________.

A．yours; mine; her

B．your; my; hers

C．yours; my; hers

D．you; my; hers