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单选题 What does the passage say about the commercialization of Halloween in the US?
单选题 What is a common barrier to starting an exercise routine mentioned in the passage?
单选题 Why did Celts wear animal-skin costumes during Samhain?
单选题 What was the original purpose of the Celtic festival Samhain?
单选题 What role did European immigrants play in the development of modern Halloween traditions?
单选题 What makes Halloween popular across different groups according to the passage?
单选题 What is the main finding of the study in the Journal of Sports Medicine?