全球城市区域是以全球城市为核心的城市区域，多个中心之间形成基于( )的内在联系，各自承担着不同的角色，既相互合作，又相互竞争，在空间上形成了一个极具特色的城市区域。

A．功能化
B．专业化
C．管理化
D．竞争化

Multipurpose Internet Mail Extension (MIME) is a (71) document messaging standard in the Internet enviroment, with MIME, users can send (72) Email 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.

A．complete

B．compound

C．simple

D．efficient