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【单选题】

onE BEnEFit thE Author mEntions is thAt thE systEm______.
A．usEs no ElECtriCity
B．hAs A FirE-sAFEty shutoFF
C．DoEs not pollutE thE Air in thE housE
D．pollutE thE Air in housE

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根据网考网移动考试中心的统计，该试题：

10%的考友选择了A选项

18%的考友选择了B选项

70%的考友选择了C选项

2%的考友选择了D选项

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