----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
----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
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。