71、Most smart phones have（）service capabilities,which means that apps that combine the phone user's location with the availability of retail stores and services can be interwoven into creative mobile business opportunities.

       A.short messaging service.

       B.global positioning satellite(GPS)

       C.online banking

       D.EDI

       72、An（），serving a function similar to a physical wallet,holds credit card numbers,electronic cash,owner identification,and owner contact information and provides that information at an electronic commerce site's checkout counter.

       A.electronic wallet

       B.electronic commerce

       C.third party payment

       D.Internet banking

       73、Since tablets and smartphones have（）interface,many people believe that all home and business computers will eventually have this kind of interface too.

       A.CRT

       B.LED

       C.touch-screen

       D.large screen

       74、（）are specialized programs that assist you locating information on the web.

       A.OS

       B.Browse

       C.DBMS

       D.Search engines

       75、Program（）describes program's objectives,desired output,input data required,processing requirement,and documentation.

       A.specification

       B.flowchart

       C.structure

       D.address