反映疾病严重程度的指标是（）
A.发病率
B.死亡率
C.感染率
D.病死率
E.生存率
参考答案：D
The two old sisters, so long, held each other and burst into tears．
A．being separated
B．having been separated
C．having separated
D．had been separated
《 * * 与公民权宣言》
