● __(71)__, businesses offer services for which they charge a fee that is based on the number of size of transactions they process.

（71）A．In the fee-for-transaction revenue model

B．In the web catalog revenue model

C．In the traditional catalog-based retail revenue' model

D．In the advertising-supported revenue model

● There are many forms of online advertising. __(72)__ is a small rectangular object on a and includes a hyperlink to the Web page that displays a stationary or moving advertiser's Web site.

（72）A．A text ad

B．A site sponsorship ad

C．A pop-up ad

D．A banner ad

● __(73)__ is a list of items that are accessible at only one end of the list.

（73）A．A tree    

B．An array    

C．A stack    

D．A queue

● Stated more formally, an object is simply __(74)__ of a class.

（74）A．a part    

B．a component

C．an instance 

D．an example

● Many computer languages provide a mechanism to call  __(75)__ provided by libraries such as in .dlls.

（75）A．instructions                    

B．functions

C．subprograms    

D．subroutines