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【单选题】


A、thE mAn-mADE BuilDing mAtEriAls lEt out DAngErous gAsEs insiDE housEs.
B．thErE mAy BE morE hArmFul gAsEs outsiDE housEs.
C．thE Flow oF Air inDoors is limitE
D、
D、inDoor Air pollution CAn mAkE A pErson sEriously ill.

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根据网考网移动考试中心的统计，该试题：

51%的考友选择了A选项

22%的考友选择了B选项

22%的考友选择了C选项

5%的考友选择了D选项

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