【导读】
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1. [单选题]Files can be lost or destroyed accidentally．Keep ______ copies of all data on removable storage media.
A. backup
B. back
C. black
D. backdown
2. [单选题]______ are web sites that search the web for occurrences of a specified word or phrase.
A. Search engines
B. WWW
C. Internet
D. Java
3. [单选题]下面哪种网络类型适合对网络进行集中管理？
A. Peer-to-Peer
B. Client/Server
