This passage mainly discusses ____________.
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1 .A necessary cause is __________.
A one without which it is impossible for the effect to occur B one of the causes that can produce the effect C one that is enough to make the effect occur D none of them
2 .Your refrigerator is not working and you have found that the electric power has been cut off. The power failure is a _________.
A necessary cause B sufficient cause C contributory cause D none of them
4 .Before you download anything from the Internet, you should first of all ________.
A make sure that you have installed anti-virus program B make sure that you have updated your backup C create a directory to store your downloads D make sure that you have cleaned up your disk space
5 .Why should you update your emergency disk before installing a program?
A Because there might be a virus in the program. B Because installing the program might change system information. C Because an emergency disk is needed while installing the program. D Because the computer will start up again after installing the program.
