As a stamp collector progresses and becomes more__________, stamps teach them basic facts about engraving and printing.

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问题 As a stamp collector progresses and becomes more__________, stamps teach them basic facts about engraving and printing.

选项 A、technical
B、theoretical
C、specialized
D、authorized

答案C

解析 选项A为“技术的,技能的”;选项B为“理论上的”;选项C为“专业的,专门的”;选项D为“批准的,授权的”。根据句意,故选C。
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