Wearing white can help people when they feel stressed.A. fall downB. calm downC. look down

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A. fall down
(答案→)B. calm down
C. look down
D. e down
解析：考查固定短语。句意“当人们感到有压力时，穿白色衣服能帮他们冷静下来。”A“跌倒”；B“冷静，平静”；C“向下看”；D“下来”。故选B。