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----What do you know the _____ of are the pig influenza in humans?

   ---- usually similar to regular human seasonal influenza .

   A. symptoms          B.sympathy           C.symbol            D.symptom

A


解析:

A考查名词词义辨析。句意:你知道人类感染猪流感后的症状吗?通常与患流行性感冒症状相似symptom症状符合句意;sympathy同情;symbol符号。从what are可以看出是复数名词。

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