【单选题】【消耗次数：1】
在操作系统中引入“进程”概念的主要目的是（）。
①
改善用户编程环境
②
提高程序的运行速度
③
描述程序动态执行过程的性质
④
使程序与计算过程一一对应
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下面的叙述哪些是正确的？( )(1)在软件开发过程中，编程作业的代价最高。 (2)良好的程序设计风格应以缩小程序占用的存储空间和提高程序的运行速度为原则。 (3)为了提高程序的运行速度，有时采用以存储空间换取运行速度的方法。 (4)对同一算法，用高级语言编写的程序比用低级语言编写的程序运行速度快。 (5)COBOL是一种非过程型语言。 (6)LISP是一种逻辑型程序设计语言。
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