Question 6 is based on the news report you have just heard.

News Report Three

    （5）Under the law in Massachusetts, tobacco companies have to measure the nicotine content of every type of cigarette and report the results. The Department of Public Health in Boston gathers and carefully examines the figures and then draws its conclusions. A hundred and sixteen brands were looked at for this study. Ninety- two were found to have higher nicotine yields than they did six years previously.（6）The biggest increases tended to be in brands that were popular with young smokers. That worries the department because of the addictive nature of nicotine. Stand Glance, a professor of medicine in San Francisco explains why. “The amount of nicotine that’s delivered in every cigarette is 10 higher than it was six years ago,which means that it is easier to get hooked and harder to quit. （7）The big tobacco companies have always insisted that they are frank with their customers about the dangers of smoking and provide them with enough detail to make an informed decision. However, （6）none of them were prepared to comment on this study or discuss the detailed nicotine content of their products.”

6. What do we learn from the study by the Department of Public Health in Boston?

原文中提到研究结果表明 92 个香烟品牌的尼古丁含量已经比过去六年要高很多，而最受年轻人欢迎的香烟品牌是尼古丁含量增幅最大的那种 ，“The biggest increases tended to be in brands that were popular with young smokers”，选项 A 与之对应，只是把 brands 所在的定语从句由“that were popular with young smokers” 同义替换改成了“young smokers like”，故正确答案为 A。