单项选择题

Questions26-30are based on the following chart : 　　Cigarette Smoking by Grade Level: 2005-2009

　　(说明：2005年为白框，2007年为灰框，2009年是黑框，扫描问题无法显示。)

Which grade saw the greatest increase of smokers over the four years（）

A．The 9th
B．The 10th
C．The 11th
D．The 12th

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