Multipurpose Internet Mail Extension (MIME

问题：

Multipurpose Internet Mail Extension (MIME) is a (76) document messaging standard in the Internet environment. With MIME, users can send (77) E-mail messages that include audio, video, graphices, and text to any other user of a TCP/IP network. Richtext information can also be (78) into messages. It defines the fonts, formats, and (79) features of a document so the document can be easily (80) on many different types of systems.

A．complete

B．compound

C．simple

D．efficient