单选题 Multipurpose Internet MaiI Extension (MIME) is a (71) document messaging standard in the Internet enviroment, with MIME, users can send (72) E-mail messages that include audio, video, graphices, and text to any other user of a TCP/IP network. Richtext information can also be (73) into messages. It defines the fonts, formats, and (74) features of a document so the document can be easily (75) on many different types of systems.