题目内容
（请给出正确答案）
[单选题]
Vaccines do not guarantee complete protection from a disease because sometimes the host’
A.muscular
B.nervous
C.endocrine
D.immune
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.muscular
B.nervous
C.endocrine
D.immune
如果结果不匹配，请 联系老师 获取答案
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