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  3. In the nineteenth century, the invention of the telegraph made it possible to send noises, signals, and even music over wires fr

In the nineteenth century, the invention of the telegraph made it possible to send noises, signals, and even music over wires fr

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问题    In the nineteenth century, the invention of the telegraph made it possible to send noises, signals, and even music over wires from one place to another. 【C1】______, the human voice had never traveled this way. Many inventors tried to find a【C2】______to send a voice over wires, and in 1876 some of their【C3】______were crowned with (使圆满结束) success. Two American【C4】______, Alexander Graham Bell and Elisha Gray, 【C5】______at almost the same time. The United States【C6】______Court finally had to decide which of the two【C7】______the first inventor of the telephone. The Court decided【C8】______Bell’s favor.
   Born in Edinburg, Scotland, Bell grew up in a family【C9】______was very interested in teaching people to【C10】______. His grandfather had been an actor who left【C11】______to teach elocution (雄辩术) ; his father was a teacher who helped deaf-mutes learn【C12】______to speak.
   However, probably none of the【C13】______inventions gave Bell the same feeling of triumph 【C14】______he had on the day【C15】______he spilled some acid from his batteries. It was after he had worked for months【C16】______he found ways to send something more【C17】______metallic twangs (“嘣”的一声) over the wires. Thinking Watson, his helper, was in the next room, Bell called, "Mr. Watson, 【C18】______. I want you. " Watson was not in the next room. He was down in his laboratory, 【C19】______to the receiver. To Watson’s【C20】______, he heard the words perfectly. He ran to tell Bell the news: the wires had carried Bell’s voice perfectly.
【C12】
选项 A、how
B、what
C、why
D、which
答案A
解析 结构衔接题。分析句子结构可知，本空所在句为并列复合句。分号后who引导定语从句，其中，______to speak为宾语从句，作learn的宾语，说明学习的内容。what和which本身就等于sth．，若填入空中，语义重复，故排除。why表示原因，不是学习的内容，也排除。how to speak意为“怎样说话”，符合语义，故为答案。句意：他的父亲是一个教聋哑者说话的老师。
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