2. 考研
  3. Cigarette Smoking by Grade Level：2005-2009 The purpose of the chart is to show_______________．

Cigarette Smoking by Grade Level：2005-2009 The purpose of the chart is to show_______________．

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问题 Cigarette Smoking by Grade Level：2005-2009
   
The purpose of the chart is to show_______________．
选项 A、the percentages of smokers in schools
B、the increase of smokers in grades 9-12 during 2005-2009
C、the number of teenage smokers in grades 9-12
D、the amount of money spent by young smokers over the years
答案B
解析 通过时间2005、2007、2009的对比，可以看出这是比较的从9年级到12年级的学生抽烟的数量增长，故本题选B。
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