单选题：Harry Potter's invisibility cloak doesn't have any real comp

题目分类：理工类
题目类型：单选题
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题目内容：

Harry Potter's invisibility cloak doesn't have any real competition yet, because __________. A．scientists have not found out how his cloak works
B．the cloaking device is a total failure
C．the cloaking device works only for microwaves
D．the cloaking device works only for visible light

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答案解析：

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分类：理工类题型：单选题

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分类：理工类题型：单选题