Cigarette Smoking by Grade Level:2005-2009 The percentage of the 9th grade smokers in 2009 was_______________.

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问题 Cigarette Smoking by Grade Level:2005-2009
   
The percentage of the 9th grade smokers in 2009 was_______________.

选项 A、23.2
B、25.2
C、31.2
D、33.4

答案D

解析 通过横轴和数轴的交叉可知,2009年9年级学生吸烟率为33.4%。
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