As children, they are about the things that they don't know about
A. curious
B. particular
C. angry
D. careful
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(答案→)A. curious
B. particular
C. angry
D. careful
解析：考查形容词：A. curious好奇，B. particular特殊，讲究，C. angry生气的，D. careful仔细的，句意：做为孩子，他们对他们不知道的事情很好奇。选A。