第27题: [单项选择]详细设计的工具各具优缺点,而PAD图的优点是( )。 A. 便于利用走树规则编写程序 B. 不受结构化设计的约束 C. 易于表达嵌套结构 D. 易于确定数据的作用域 参考答案:A 答案解析:[解析] PAD图指问题分析图,它的优点主要是:便于利用走树规则编写程序,有利于提高软件的生产率;描绘的程序结构非常清晰:设计出来的程序是结构化程序。可见,选项A是PAD的优点。
第28题: [单项选择]Questions 19 to 22 are based on the conversation you have just heard. A. Yesterday morning. B. Yesterday noon. C. Yesterday afternoon. D. Yesterday evening. 参考答案:C 答案解析:[听力原文] 19-22 M:Good morning.Miss White.I’m Bill Green.Yesterday afternoon I called you. W:Ah,y
第32题: [单项选择]To carry out a company's rules and regulations, administrative personnel must know ______. A. to be firm B. being firm C. what to be firm D. how to be firm 参考答案:D 答案解析:know后接宾语how to be firm,意为“如何坚定不移”。