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单选题
Which of the following statements does NOT refer to smallpox?
A
Previous projects had failed.
B
People are no longer vaccinated for it.
C
The World Health Organization mounted a worldwide campaign to eradicate the disease.
D
It was a serious threat.
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参考解析
解析：
是非题。第二段最后一句提到“Because similar projects for malaria and yellow fever had failed, few believed that smallpox could actually be eradicated”，即以前对疟疾和黄热病开展的类似项目都失败了，因此几乎没有人相信天花可以被彻底根除。并不是说以前开展根除天花的项目失败了。因此选项A表述错误。
是非题。第二段最后一句提到“Because similar projects for malaria and yellow fever had failed, few believed that smallpox could actually be eradicated”，即以前对疟疾和黄热病开展的类似项目都失败了，因此几乎没有人相信天花可以被彻底根除。并不是说以前开展根除天花的项目失败了。因此选项A表述错误。
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