反映左心室舒张功能受损的指标是（）。

A.E峰值速度升高

B.A峰值速度减低

C.E／A>1

D.E／A<1

E.E／A=1

—_____ ?

—I'm twelve. [ ]

A. What's your name                  

B. How are you

C. What class are you in              

D. How old are you