单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. The computer sends signal in the form of ______.

A．electrical impulses
B．machines
C．instructions
D．automatic impulses

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单项选择题

单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. The computer sends signal in the form of ______. 您的浏览器不支持 audio 元素。