问题
单项选择题
______ are designed to manage large bodies of information.
A.I/O ports
B.Printers
C.Database system
D.Keyboards
答案
参考答案:C
解析:题目的大意是:数据库系统被设计用来管理大批量的信息。I/O ports:I/O接口,Printers:打印机,Database system:数据库系统,Keyboards:键盘。