第14题: [单项选择]What does the man prefer to do on weekend nights A. To keep his old car. B. To leave it in the garage to be repaired. C. To buy a new car. D. To sell his old car. 参考答案:C 答案解析:[听力原文] W: You are back late. I was worried. How is the car What did you find out about it M:
第17题: [单项选择]在数据流图(DFD) 中,带有名字的箭头表示 A. 模块之间的调用关系 B. 程序的组成成分 C. 控制程序的执行顺序 D. 数据的流向 参考答案:D 答案解析:[解析] 数据流相当于一条管道,并有一级数据(信息)流经它。在数据流图中,用标有名字的箭头表示数据流。数据流可以从加工流向加工,也可以从加工流向文件或从文件流向加工,并且可以从外部实体流向系统或从系统