Upon reaching an/a age, children are encouraged, but not forced, to “leave the nest”.
A. appropriate
B. potential
C. permanent
D. automatic
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(答案→)A. appropriate
B. potential
C. permanent
D. automatic
解析: 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。