A.if they experience prolonged high levels of cortisol,
they both will have more behavior problems than their peers
B.if boys hit puberty at earlier ages,
they tend to have behavior problems
C.abnormalities in cortisol secretion aren't associated with aggressive behavior D.cortisol secretion is more important for girls
39.From the last paragraph we can infer that ________.
A.parents should be watchful to bedtime activities of their children
B. we must make sure that children don't do wrong things
C.good sleep is important for children's good performance at school
D.bedtime activities are important
40.What's the best title for the passage?
A.Sleep patterns are linked to teen behavior
B.Staying up late is a bad habit
C.The youth like to sleep late
D.Antisocial behavior is due to overtime night activities
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