在某特定时间内总人口中某病新旧病例数所占的比例()
A.发病率
B.死亡率
C.罹患率
D.病死率
E.患病率
参考答案:E
— I missed the first part of the film. It was really a pity.
— You _____ home half an hour earlier. [ ]
A. should go
B. must have gone
C. should leave
D. should have left
读“四国轮廓图”,回答下列问题。
四个国家都有回归线穿过,其中有沙漠分布的国家是()
A.甲乙丙丁
B.甲丁
C.乙丙丁
D.甲乙丁