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。)

What tendency can we find from the chart（）

A．Smokers in all grades have increased
B．The higher the grade， the more the smokers
C．The older a student， the more he smokes
D．Low graders smoke less heavily

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