|
专限时训练(十八) [说明文型完形填空] (限时：每篇10分钟) (一) A survey done by the University of Michigan shows a big drop in the number of teenagers who say they smoke cigarettes. In the survey, over 44,000 students in grades 8, 10 and 12, from 424 schools across the __1__ were asked about their smoking habits. The results show that smoking among 8th graders __2__ from 21 percent in 2002, to 12 percent in 2007.In the same period, smoking dropped from 30% to 21 % among 10th graders and from 37 % to 30 % among 12th graders. Antismoking organizations think educating kids about smoking risks are the __3__ of the drop. “The important __4__ in teen smoking did not just happen by chance，” says study director Lloyd D．Johnston. “A lot of individuals and organizations have been trying to __5__ the high rates of teenagers.” Others say the __6__ price of cigarettes is an important reason teens are cutting back. __7__ the reason, the drop in teen smoking is good news to everyone, even cigarettemaking companies who __8__ their product is only for adults, not kids. Health experts are particularly | 
