We modern people eat not only when we are hungry but also when we are in bad mood. Eating fish and walnuts may help keep our sp

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问题 We modern people eat not only when we are hungry but also when we are in bad mood.
Eating fish and walnuts may help keep our spirits up, because they contains ______.

选项

答案fatty acids

解析 由题干关键词fish and walnuts定位到第二个小标题下第二段第一句和最后一句。第一句指出鱼和胡桃富含脂肪酸,最后一句指出食用含脂肪酸的食品可以使我们精神振奋。也就是说,食用鱼和胡桃可以使我们精神振奋,因为它们富含脂肪酸。
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