选出应填入下面一段英语中______内的正确答案。 Rapid application development (RAD) systems purport to
选出应填入下面一段英语中______内的正确答案。
Rapid application development (RAD) systems purport to lighten the developer's(1)by making it easy to program an application with simple intuitive steps.
RAD tools(2)the developer everything needed to construct afully functional application quickly and easily. They make short work of modifying the developed with product to(3)changes after the program is finished. Applications developed with RAD tools are constructed as they are envisioned. As an application's real usefulness(4), the developer armed with a RAD tools should be able to(5)on new features with little fuss.