澳大利亚应急管理署将“危险”划分为（）
A.自然危险
B.技术危险
C.社会危险
D.生物危险
E.民防与政治危险
参考答案：A, B, D, E
---Have you finished all your exercises?
---Yes, ___ is left. As a matter of fact, they are as easy as ABC.
A. nothing B. not one C. none D. neither
首选诊断早孕的辅助检查方法是
A． * * 脱落细胞学检查B．基础体温测定C．尿妊娠试验D．黄体酮试验E．宫颈黏液涂片干燥后镜检
