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题目材料：
The infectious disease known as whooping cough is commonly thought to be a childhood illness, but a recent study suggests that more adults contract this illness than was previously suspected. Although the disease is life-threatening in children, in adults it typically causes only a persistent cough which, though annoying,is rarely serious. Therefore, the incidence of whooping cough in adults poses no significant public health threat.
以上解析由 考满分老师提供。
