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    The United States _______one of the lowest smoking rates －25.5 percent of the population.
    A．isB．haveC．hasD．are
    C
    考察主谓一致.句意:美国有最低的吸烟率_人口的22.5%. be动词的意思是,故用have没The United States指的美国,为第三人称单数,故谓语动词用单属形式,选C.
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