【正确答案】The tendency of infant mortality and life expectancy
Indicated above is a set of graphs showing the tendency of infant mortality and life expectancy in a country for the past 50 years. According to the bar chart on the left, infant mortality declined from about 150 per thousand in 1949 to less than 50 in 2002. In the same period, life expectancy of old people is on the rise. As is illustrated from the bar chart on the right, it has increased from 40 years old to more than 70 years old.
Personally, I believe that two reasons can account for this change. First, medical skills have been greatly improved in the past fifty years. As a result, doctors and nurses can resort to more advanced medical technologies to keep track of children's physical conditions, which will best illustrate the decline of infant mortality. Second, along with the economic growth, people's living standards have become better. In this situation, people are well-fed, and warmly clothed. Under comfortable living conditions, people's life expectancy increased accordingly.
On the basis of the analysis above, it is safe to conclude that certain exciting changes have taken place in this country. I believe that this trend will be going on for a better direction.