Once you´ve made the Internet connection，you can send（）to anyof computer user all around the world.

单项选择题Small business may use（）for word processing.

A.microcomputers
B.industrial computers
C.mainframe computers
D.supercomputers

单项选择题（）system let you run more than one program at a time.

A.Application
B.Software
C.Real time
D.Multitask