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It can be inferred from the passage that________

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It can be inferred from the passage that________

A.natural materials are safe in food processing

B.chemicals are needed in food processing

C.food poisoning can be kept under control

D.food poisoning is out of control

参考答案:

C由文中第五段第一句话可推测出C正确

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[名词解释] 自然杀伤细胞（naturalkillercell，NK）

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