下列哪个指标是用于测定发病率不准确且病死率极低的传染病流行强度（）

A.累积死亡率

B.现患率

C.超额死亡率

D.病死率

E.以上都不是

My parents expected too much of me. When they heard that I hadn’t passed the college entrance examination, they almost ______.

A．broke up

B．broke down

C．broke off

D．broke out