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Edward Jenner　discovered（）at the end of the 18th century.

Edward Jenner　discovered（）at the end of the 18th century.
A.hepatitis vaccine
B.varicella vaccine
C.influenza vaccine
D.smallpox vaccine
正确答案：smallpox vaccine

标签：医药英语

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Edward Jenner discovered（）at the end of the 18th century.

Edward Jenner　discovered（）at the end of the 18th century.