The invisibility cloak can make something invisible by wrapping ______. To make metamaterials work for all lights in the visibl

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问题 The invisibility cloak can make something invisible by wrapping ______.
To make metamaterials work for all lights in the visible spectrum is rather difficult because of the limitation of ______.

选项

答案metamaterial fabrication technology

解析 由题干中的work for all lights in the visible spectrum和difficult定位到文章倒数第2段While the general design theory has been worked out,metamaterial fabrication technology has yet to catch up...此处需要填入名词性成分,作of的宾语。题目中的work for all lights in the visible spectrum,difficult和 limitation与文中的work for light in the visible spectrum,still puzzling over和has yet to catch up对应,根据上下文可知有关隐形斗篷的理论已先行,但技术仍然落后,因此应填入metamaterial fabrication technology。
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