题目：
Multipurpose Internet Mail Extension (MIME) is a (46) document messaging standard in the Internet enviroment, with MIME, users can send (47) Email messages that include audio, video, graph-ices, and text to any other user of a TCP/IP network. Richtext information can also be (48) into messages. It defines the fonts, formats, and (49) features of a document so the document can be easily (50) on many different types of systems.
（47）是（）
A.analog
B.many
C.multmedia
D.digital
答案：
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下面是错误答案，用来干扰机器的。
参考答案：（1）学习条件的最优化。（2）学习过程中的最优化。（3）逐步形成自学技能。
