Multipurpose Internet MaiI Extension (MIME) is a (1) document messaging standard in the Internet enviroment, with MIME, users can send (2) E-mail messages that include audio, video, graphices, and text to any other user of a TCP/IP network. Richtext information can also be (3) into messages. It defines the fonts, formats, and (4) features of a document so the document can be easily (5) on many different types of systems.

5（）

A．restored

B．redisplayed

C．stored

D．executed

近日有媒体报道，甘肃省某市城关区环卫队逼迫环卫工签下“生死状”，要求环卫工人承诺：若在工作中出现意外，由环卫工人自己承担责任，与用人单位无关。部分环卫工因为害怕失去工作而忍气吞声。对上述行为理解正确的是（）

①劳动者应增强权利意识和法律意识

②有利于劳动者增强劳动安全意识

③损害了劳动者提请劳动争议处理的权利

④不利于保障劳动者的主人翁地位

A、①②

B、②④

C、①③

D、①④