单项选择题

下列关于脓肿的说法不正确的是
A、常发生于皮下和内脏
B、单个毛囊的脓肿可称为痈
C、较大脓肿愈合后形成瘢痕
D、多由金黄色葡萄球菌引起

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According to Ricardo, a country will have a comparative advantage in the product in which its _____________.

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