----What do you know the _____ of are th
题型:选择题
问题:
----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