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Upon reaching an/a ______  age, children are encouraged, but not forced, to “leave the nest”.  
A.appropriateB.potentialC.permanentD.automatic
A
考查词义辨析。Appropriate 合适的,potential 有潜力的,permanent 永久的,automatic 自动的,句意:一到达一个合适的年龄,孩子们被鼓励而不是被强迫离开家。所以选A。
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