问题补充：
Children are often full of and they take great interest in everything.
A. concern
B. purpose
C. curiosity
D. strength
答案：
A. concern
B. purpose
(答案→)C. curiosity
D. strength
解析：名词词义辨析。A担心；B目的；C好奇；D力气；句意：孩子们总是充满了好奇，对于所有事情都有兴趣。根据句意说明C正确。
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