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【单选题】

Smallpox was an infectious disease but it was () worldwide 40 years ago through vaccination.

A.
originated
B.
contradicted
C.
participated
D.
eradicated
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参考答案:
参考解析:
.
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【多选题】铅中毒多为慢性中毒,主要表现在()

A.
神经系统
B.
消化系统
C.
免疫系统
D.
造血系统