在商业单据中处于中心单据地位的是( )。
A．商业发票
B．海关发票
C．海运提单
D．保险单
参考答案：A
It is not within the scope of this article to present test procedures in detail, but rather______ a brief outline of each and the significance of the results.
A．giving
B．to give
C．given
D．gives
WWW又可以称为（）。
A.WorldWideWeb
B.InternetExplorer
C.NetscapeCommunicator
D.万维网
