●   A __(71)__ infected computer may lose its data.
 

（71）A．file 

B．data base

C．virus 

D．program

●   We can use the word processor to __(72)__your documents.
 

（72）A．edit 

B．compute

C．translate 

D．unload

●   To document your code can  increase program  __(73)__ and make program easier to __(74)__.
 

（73）A．reliability

B．security 

C．readability

D．usability

（74）A．execute  

B．interpret 

C．compile   

D．maintain

● As an operating system repeatedly allocates and frees storage space， many physically separated unused areas appear.This phenomenon is called  __(75)__.
 

（75）A．fragmentation 

B．compaction   

C．swapping 

D．paging