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【单选题】

ACCorDing to thE pAssAgE , BEForE miCroBEs wErE DisCovErED it wAs BEliEvED thAt somE DisEAsEs wErE CAusED By ______.
A．gErm-CArrying insECts
B．CErtAin strAins oF BACtEriA
C．Foul oDors rElEAsED From swAmps
D．slimy CrEAturEs living nEAr swAmps

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根据网考网移动考试中心的统计，该试题：

1%的考友选择了A选项

18%的考友选择了B选项

80%的考友选择了C选项

1%的考友选择了D选项

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