男性，20岁。胫腓骨骨折，行切开复位钢板内固定，手术结束时小腿肿胀明显，张力大，闭合创口困难。此时，闭合创口的最佳方法是（）

A.暂不缝合，延期缝合

B.尽力直接缝合

C.开放换药，直到愈合

D.两侧作减张切口，缝合原创口

E.两侧作减张切口，缝合原创口，减张切口处，游离植皮覆盖

(66) is defined as the buying and selling of products and services over the Internet. It had included the handling of purchase (67) and funds transfers over computer networks from its inception.

A．jobs

B．transactions

C．programs

D．files