题目内容：
Which of the following descriptions of the susceptible animals are right （）
A.Susceptible animals include the animals that are susceptible to certain kinds of parasites because of lacking immunity
B.Susceptible animals include the animals that are susceptible to certain kinds of parasites because of their low immunity
C.Different breeds of animals appear to have different levels of susceptibility to the same parasite species.
D.Every animal species is only susceptible to certain kinds of parasite species.
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