Application software (also called end-user program) is designed to perform a specific function directly for the user. ()

Without systems software, application software in a computer is(73)

A．nouse

B．useful

C．useness

D．useless

to interactwith the computer.

A．all programs

B．system software and application software

C．operating system and application software

D．operating system and office software

？？？？

？？？？Software engineering is the study and application of engineering to the （71）

？？development and maintenance of software？？？？？？

？？？？

A.A.research

B.B.management

C.C.assembly

D.D.design

Generally software can be divided into two types:（）software and application software.

A.system B.I/O C.control D.database

A.programs

B.all kinds of files

C.video games

D.websites

E.mobile application

A．commercial software and open source software

B．business software and open source software

C．productivity software and system software

D．system software and application software

n softwareThe operating system performs a number of functions that allow the user and the application software to interactwith the computer.