【答案解析】[参考范文]: Indicated above is a graph that shows the changes of consumer index in a certain country for the past 50 years. According to the survey, in spite of fluctuation, the price index was on the rise. In 1930, it was merely 25 points. Years later, however, it hit a record of 150 points in 1980. Obviously, certain dramatic changes have taken place in this country in the past years What brought about these changes? Personally, I believe that two reasons can account for the changes. First, along with the economic growth, people's living standards have been greatly improved. As a result, citizens are more willing to spend their money on clothes, food, or entertainment. Second, measures taken by government departments have encouraged people to consume, which partially contribute to the rise of price index. In a sense, the changeover in the price index has best illustrated the above-mentioned observation. On the basis of the analysis above, it is safe to conclude that certain encouraging changes have taken place in the pattern of consumption in that country. Still, as long as their economy is running on the right track, such a tendency will be going on in a more exciting direction.