第10题: [单项选择]调制解调器的功能是______。 A. 数字信号转换成声音信号 B. 模拟信号转换成数字信号 C. 数字信号转换成其他信号 D. 数字信号与模拟信号之间的相互转换 参考答案:D 答案解析:[解析] 调制解调器(即MODEM),是计算机与电话线之间进行信号转换的装置,由调制器和解调器两部分组成,调制器是把计算机的数字信号(如文件等)调制成可在电话线上传输的模拟信号(如声音信号)的装置,在
第23题: [单项选择]Questions 22 to 25 are based on the conversation you have just heard. A. Finish their course work. B. Plan out their holiday in detail. C. Head for Sydney. D. Buy some necessities for their trip. 参考答案:B 答案解析:[听力原文] What will the two speakers probably do next