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Upon reaching an/a ______  age, children are encouraged, but not forced, to “l(fā)eave the nest”.  
A．appropriateB．potentialC．permanentD．automatic
A
考查詞義辨析。Appropriate 合適的，potential 有潛力的，permanent 永久的，automatic 自動的，句意：一到達一個合適的年齡，孩子們被鼓勵而不是被強迫離開家。所以選A。
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