A vaccine is a biological preparation that improves()to a particular disease.
A vaccine is a biological preparation that improves()to a particular disease.
A.immune
B.immunity
C.immunization
D.deficiency
正确答案:immunity
A vaccine is a biological preparation that improves()to a particular disease.
A.immune
B.immunity
C.immunization
D.deficiency
正确答案:immunity
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