单选题：Harry Potter’s invisibility cloak doesn’t have any real com

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 fight

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