问题补充：
Peter is about the world around him and wants to know everything about it.
A. curious
B. excited
C. worried
D. crazy
答案：
(答案→)A. curious
B. excited
C. worried
D. crazy
解析：根据wants to know everything about it可知，Peter是一个求知欲很强大的孩子。在四个选项中A是”求知欲强的，好奇的“，B是”兴奋的“，C是”担心的“，D是“疯狂的”。所以本题选A。
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