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【单选题】

New strains of viruses are transmitted to man by ______ .
A.A type of wild pig

B.diseased lower animals
C.a group of migrating birds
D.a variety of means
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根据网考网移动考试中心的统计,该试题:

15%的考友选择了A选项

16%的考友选择了B选项

9%的考友选择了C选项

60%的考友选择了D选项

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