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6.As diet and health improved [A] children and adolescents have, on average, increased in height to [B] about an inch and a half every 20 years, a pattern known as [C] the obvious trend in height [D].
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6.As diet and health improved [A] children and adolescents have, on average, increased in height to [B] about an inch and a half every 20 years, a pattern known as [C] the obvious trend in height [D].
