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) .

（71）处填（）。

A．make-up

B．madeup

C．markup

D．makeup

根据横断面调查可以计算（）

A.患病率

B.死亡率

C.治愈率

D.生存率

E.发病率