Cigarette Smoking by Grade Level:2005-2009 Which grade saw the greatest increase of smokers over the four years?

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问题 Cigarette Smoking by Grade Level:2005-2009
   
Which grade saw the greatest increase of smokers over the four years?

选项 A、The 9th
B、The 10th
C、The 11th
D、The 12th

答案A

解析 9年级四年的增长为10.2%(33.4-23.3),10年级为10.1%(35.3-25.2),11年级为5%(36.6-31.6),12年级为9.5%(39.6-30.1),因此,增长最大的为9年级。故本题选A。
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