对个人购买并居住超过一年的普通住宅，销售时征免营业税的规定是( )。

A．全额征收

B．免征

C．减半征收

D．按销售价减去购入原价后的差额计征

Because Web servers axe platform and application (71) , they can send or request data from legacy or external applications including databases. All replies, once converted into (72) . mark-up language, can then be transmitted to a (73) .Used in this way, Intranets can (74) lower desktop support costs, easy links with legacy applications and databases and, (75) all, ease of use.

（72）处填（）。

A．ciphertext

B．hypertext

C．plaintext

D．supertext