问题
单项选择题
在数据通信中，利用电话交换网与调制解调器进行数据传输的方法属于
A．频带传输
B．宽带传输
C．基带传输
D．IP传输
答案
参考答案：A
解析：电话线路是为传输音频信号而建设的。
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在数据通信中，利用电话交换网与调制解调器进行数据传输的方法属于
A．频带传输
B．宽带传输
C．基带传输
D．IP传输
参考答案：A
解析：电话线路是为传输音频信号而建设的。
Mr. Evans lives and works in Sydney. Last week he had a______holiday, but he didn’t know______ to go. He said to his friend Robert “I hate the hot weather here, but I can’t______a cool place in Australia. Where should I go______a holiday?” “That’s easy,” said Robert, ” You can go to Moscow. Snow and ice are covering the ground there now.” Mr. Evens______ his advice. He bought a plane ticket and______Moscow. He enjoyed himself there, but one day he got into trouble. After lunch______a cold day, he went to a park in the city. He found that a dog followed him when he walked______a house. It seemed hungry. Maybe it wanted some food______,he thought. However, Mr. Evans had______ food in his pockets. He tried to make the dog______, but it began to bark at him. Just at that moment, he______a small stone on the ground. He tried to pick it up, but he______. “______strange these Russians are!” Mr. Evans said to______.”They tie up stones instead of their dogs.
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