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    【题目】Obesity is ________ major concern for public health officials and also may affect ________ test scores of students.
    A.a; /
    B.a; a
    C.the; /
    D.the; the

    【答案】A
    【解析】句意：肥胖是公共卫生官员的一个主要关注，也可能影响学生的测试分数。第一空表示泛指，用不定冠词；第二空后是名词复数形式，不用冠词，所以答案是A。

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