The concept of upward social mobility has been an abiding feature of American li

游客2025-01-28 51

问题 The concept of upward social mobility has been an abiding feature of American life.

选项 A、enduring
B、unaffected
C、intriguing
D、observing

答案 A

解析 abiding(持久的)；enduring(与abiding同义)；unaffected(真挚的，自然的)；intriguing(迷人的，引起兴趣的)；observable(可观察的)。

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