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  3. The United States calls for some countries to research the bionics since 1960. Bionicists do research on the unique quality of

The United States calls for some countries to research the bionics since 1960. Bionicists do research on the unique quality of

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问题 The United States calls for some countries to research the bionics since 1960.
Bionicists do research on the unique quality of owls’ sensitive heating and engage in designing ______.
选项
答案sensitive mechanic ears for listening to enemy sonar
解析 文章第十四段最后一句话指出"…those engaged in designing sensitive mechanic ears for listening to enemy sonar…"设计敏感性听觉系统探测敌人的声呐装置，由此可知此处该填sensitive mechanic ears for listening to enemy sonar。
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大学英语四级

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