问题
单项选择题
Questions 9—10 are based on the following graph.
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
答案
参考答案：B
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。
