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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.
【C15】
选项 A、which
B、when
C、that
D、how
答案B
解析 结构衔接题。分析句子结构可知，he spilled some acid from his batteries为定语从句，结合空前的the day和从句主谓宾完整可知，本空应填表示时间的关系副词，故答案为when。
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