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A、BECAusE thEy pollutE Air.
B、BECAusE thEy ArE nAturAl hAzArDs.
C．BECAusE thEy ArE inCrEAsing in numBErs.
D．BECAusE pEoplE Don’’t wAlk so oFtEn.

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根据网考网移动考试中心的统计，该试题：

5%的考友选择了A选项

5%的考友选择了B选项

14%的考友选择了C选项

76%的考友选择了D选项

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