Riboflavin helps the body obtain energy from carbohydrates and protein substances.

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问题 Riboflavin helps the body obtain energy from carbohydrates and protein substances.

选项 A、roots
B、flavours
C、powers
D、material

答案D

解析 substances “物质”;roots“根,根源”;flavours “味,味道”;powers“权力,影响力”; material “材料,原料”。根据句意,这里应该是说从碳水化合物和蛋白质中获取能力。只有material有“物质,材料”的意思,故选D。
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