Children to difficult situations are better at handling those tasks.A. exposing; challen

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A. exposing; challenging
B. exposed; challenged
(答案→)C. exposed; challenging
D. exposing; challenged
解析：考查过去分词做定语和形容词：句意为：接触不同困难处境的孩子更善于处理具有挑战性的任务。 exposed to...为过去分词作定语；challenging“具有挑战性的”。选C。