单选题
Questions 9—10 are based on the following graph.
单选题
The claim that Civenia's antismoking television advertising campaign contributed significantly to the steep decline in cigarette purchases in that province during 1991 is best supported if which of the following has been true about the province of Halbernia from the beginning of 1991?
【正确答案】
B
【答案解析】[解析] 由图上看出，1991年以前两省香烟销售量下降速度基本保持一致，Civenia省开展广告活动的1991年，其香烟销售量骤减，而1992年终止活动时，销售量基本上不再下降，而Halbernia省香烟销售量下降幅度与往年基本持平，(B)通过指出Halbernia省在1991年初没有进行广告活动，所以没有出现象Civenia那样的急剧下降，而起到了最好的支持作用。
单选题
Which of the following, if tree, most helps to explain why cigarette purchases in Civenia declined more slowly after the completion of the television antismoking advertising campaign than they did before the campaign began?
【正确答案】
B
【答案解析】[解析] 1992年香烟销售下降慢于1990年，为什么?(B)指出可能戒烟或减少吸烟的人付诸行动，所以，1992年香烟销售下降了，所以(B)正确；(A)只说明香烟销售下降快的原因；(C)、(D)、(E)无法解释上面问题目的。