下列关于社会保险的各项描述中()是正确的
A.被保险人是所有公民
B.国家基本保险具有强制性
C.保险基金实行社会统筹
D.承保人为经营性的商业保险公司
参考答案:B, C
— We are too busy to take _____ holiday at _____ present.
— But I think we'll be able to take _____ two weeks from now. [ ]
A. a; /; one
B. the; /; that
C. a; the; it
D a; /; it
“文件跟踪”是为“催查办”提供可靠的依据。