Rapid application development (RAD) systems purport to lighten the developer’s (46) by making it easy to program an application with simple intuitive steps.

RAD tools (47) the developer everything needed to construct a fully functional application quickly and easily. They make short work of modifying the developed product to (48) changes after the program is finished. Applications developed with RAD tools are constructed as they are envisioned. As an application’s real usefulness (49) , the developer armed with RAD tools should be able to (50) on new features with little fuss.

（48）是（）

A.accommodate

B.account

C.decrease

D.eliminate

项目计划对于变更控制非常重要，这是因为它可以：针对管理哪些变更提供基准计划（）

A、针对管理哪些变更提供基准计划

B、为执行项目提供信息

C、提醒项目团队哪些问题将来可能引起问题

D、在整个项目期间变化