《劳动法》72条、《劳动合同法》和《社会保险费征缴的暂行条例》等多部法律、法规明确规定：用人单位必须为劳动者缴纳（），缴纳社会保险费
A. 社会保险
B. 商业保险
C. 养老保险
D. 企业年金
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在工作时间和工作场所内，因（）受到事故伤害的；可以认定魏工伤
A. 私人原因
B. 单位原因
C. 个人原因
D. 工作原因
[音频]Long Conversation
A. He is the only boy in his family
B. He becomes tearful in wind
C. He has stoppedmaking terrible faces
D. He is his teacher's favorite student
[音频]Passage
A. Everything seemed to be changing.
B. People were formal and disciplined.
C. People were excited to go travelling overseas.
D. Things from the Victorian era came back alive.
文件系统的主要目的是（ ）。
A. 实现对文件的按名存取
B. 实现虚拟存储
C. 提高文件的读写速度
D. 保护用户文件不丢失
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