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【单选题】
男性，20岁，体格检查时胸部透视发现上纵隔影增宽，CT检查示上纵隔占位，下列哪项诊断最不可能A.
畸胎瘤
B.
胸骨后甲状腺肿
C.
胸腺瘤
D.
支气管囊肿
E.
降主动脉瘤
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举一反三
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【简答题】中间色调、明暗交界线、反光和
【单选题】Like any large country, the USA has several ______ regions and each region boasts its own special style of food.
A.
distinguish
B.
instinct
C.
distinct
D.
district
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