----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考查名詞詞義辨析。句意：你知道人類感染豬流感后的癥狀嗎？通常與患流行性感冒癥狀相似symptom癥狀符合句意;sympathy同情；symbol符號(hào)。從what are可以看出是復(fù)數(shù)名詞。

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