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【单选题】
免疫功能正常的人不易得恶性肿瘤,艾滋病等免疫功能低下或缺陷的人患恶性肿瘤的概率则大幅度上升,这是因为免疫系统具有以下哪种功能A.
免疫防御
B.
免疫耐受
C.
免疫监视
D.
免疫调节
E.
免疫自稳
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【简答题】二氧化硒氧化烯丙位生成烯丙醇属于 机理。
【单选题】Peter wishes that he ___ law instead of literature when he was in college.
A.
studied
B.
had studied
C.
could study
D.
would study
【单选题】Peter wishes that he______ law instead of literature when he was in college.
A.
had studied
B.
studied
C.
could study
D.
would study
【单选题】Peter wishes that he _____ law instead of literature when he was in college.
A.
had studied
B.
would study
C.
studied
D.
could study
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