填空题

Researchers claim that as little as five minutes exposure to common domestic electrical appliance will impair ______.

【参考答案】

brain performance

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填空题

Because of the effects of an electromagnetic field on growing cells, ______ are the ones who easily fall victim to its effects.

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Any frequency close to 30Hz will interfere with cues that keep our biological cycles properly timed because the frequecies are close to the ______ of man.