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题目材料:
A recent biostatistical study attempted to determine the relationship between childhood and adult obesity. Across all weight, sex, racial, and ethnic groups, most of the severely obese teenagers in the study—defined as having a body mass index greater than or equal to 40—did not become severely obese as adults. However, a large proportion of severely obese teens remained so into adulthood. At greatest risk of becoming severely obese were black females.
以上解析由 考满分老师提供。