听句子，缩写原文。（）

A．Most of them are from low-income belies.

B．Most of them are in favor of a tax cut.

C．I know the Congress will veto the tax reform.

D．I propose the tax reform be debated in the Congress.

描述某一人群中某种疾病的频率，最常用的指标为（）。

A.发病率、死亡率、病死率

B.发病率、患病率、生存率

C.发病率、死亡率、感染率

D.发病率、死亡率、患病率

E.死亡率、患病率、续发率