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Why does Dr Povey say the fact that light waves can not penetrate walls is a bonus?A.Becau


Why does Dr Povey say the fact that light waves can not penetrate walls is a bonus?

A.Because more energy can be concentrated.

B.Because it can save a lot of money.

C.Because it doesn"t pose risks to health.

D.Because secrets can be better protected.

请帮忙给出正确答案和分析,谢谢!

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