单项选择题

Yahoo, eBay, Amazon, CNN, Buy, eTrade and zNet are （）

A．stores on the web
B．large commercial web sites
C．small commercial web sites
D．public government web sites

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热门试题

单项选择题

If someone sends a message the size of one gigabyte, （）

A．it is large
B．it is very small
C．it takes little time for a computer to read
D．it is the size of a short note

单项选择题

A hacker is （）

A．someone who breaks into and uses someone else's computer
B．someone who breaks commercials
C．someone who fixes someone else's computer
D．someone who does not know about computers