填空题从供选择的答案中选出应填入下列英文语句中 1内的正确答案。
PCs originated as stand-alone (1) , however,in recent years many have been (2) to Local Area Networks (LANs). In a LAN, the data and usually the user application reside on the File Server, a PC running a special Network Operating System (NOS) such as Novell's NetWare or Microsoft's LAN Manager. The File Server manages the LAN users' shared access to data on its hard (3) and frequently provides access to other shared resources, such as printers. While a LAN enables users of PC-based databases to share (4) data files, it doesn't significantly change how the DBMS works; all the actual data (5) is still performed on the PC running the database application.
供选择的答案：
(1) calculating (2) common (3) connected (4) disks (5) displayed
(6) systems (7) printers (8) processing (9) some (10) workstations

1、

【正确答案】 1、systems connected disks common processing

【答案解析】根据句意，选systems。本句的意思是“PC源于单机系统。”
[参考译文]PC源于单机系统，然而近年来有许多PC被连到局域网上。在局域网中，数据和用户应用程序通常存放在文件服务器上，文件服务器由PC充当，运行网络操作系统，如Novell公司的NetWare或微软的LAN Manager。文件服务器管理局域网用户对硬盘数据的共享存取，并时常提供其他共享资源的访问，如打印机。当局域网让基于PC的数据库用户共享普通的数据文件时，它不能改变DBMS的工作方式，实际上所有的数据处理仍然由运行数据库应用程序的PC承担。本句应该选一个过去分词，根据句意，选(3)，意思是“然而，近年来有许多PC被连到局域网上”。 hard discs是硬盘。本句应该填一个形容词，common的意思是“公共的，公用的”，符合题意。 perform的宾语是all the actual data processing，意思是“实际上处理所有的数据”。