单选题：How do the immune cells recognize an antigen as“foreign”or“n

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题目类型：单选题
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题目内容：

How do the immune cells recognize an antigen as“foreign”or“nonself”? A．Through an allergic respons
B．Through blood typ
C．Through characteristic shapes on the antigen surfac
D．Through fine hairs protruding from the antigen surfac

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The decision to invade provoked storms of protest． A．ignored B．organized C．cause

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