Any time you are active,　5　energy is required.

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【解析】选[B]。空后的名词energy表明此处应填形容词，故[B]additional、[IJ]effective、[E]more、[J]efficient、 [M]less入选。上段是说保证身体基本功能的能量，而此处是说，任何时候只要你活动，你都需要额外的能量。[B] additional(额外的)在此处符合句意。

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Any time you are active, 5 energy is required.

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Any time you are active,　5　energy is required.