Children are always asking all kinds of questions because they are about the world they live in.
A. curious
B. worried
C. anxious
D. careful
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(答案→)A. curious
B. worried
C. anxious
D. careful
解析：词义辨析。A. 好奇的，古怪的 B. 担心的，焦急的 C. 担忧的，渴望的D.仔细的。句意：因为他们对于他们生活的这个世界很好奇，孩子们总是问各种各样的问题。故选A。