单项选择题
Because Web servers are platform and application (66) , they can send or request data from legacy or external applications including databases. All replies, once converted into (67) mark - up language, can then be transmitted to a (68) . Used in this way, Intranets can (69) lower desktop support costs, easy links with legacy applications and databases and, (70) all, ease of use.
（67）处填（）。
A．ciphertext
B．hypertext
C．paintext
D．supertext