XML is a (71) language for documents containing (72) information.

Structured information contains both content(words, pictures, etc.)and some indication of what role that content plays(for example, content in a section heading has a different meaning from content in a footnote, which means something different than content in a figure caption or content in a database table, etc.). Almost all documents have some structure.

A markup language is a (73) to (74) structures in a document. The XML specification defines a standard way to add markup to (75) .

（73）处填（）。

A．algorithm

B．arithmetic

C．mechanism

D．mechanistic

中国的外交布局：（）是关键，（）是首要，（）是基础，（）是重要舞台。

A.周边-多边-大国-发展中国家

B.大国-周边-发展中国家-多边

C.大国-发展中国家-多边-周边

D.发展中国家-大国-周边-多边