A study in 1991 showed that the life expectancy had increased and the infant mortality had decreased in developing countries since 1960.
As you may see from the diagram, the life expectancy in 1960 was 40 years old and it was about 60 in 1990. And we can see from the diagram, the infant mortality was about 200 deaths per 1,000 births in 1960, and it was approximately just below 100 in 1990.
The reasons that mused changes are diverse. On the one hand, the medical service is better than before. The new statistical data show that a good doctor can save 1,000 peo ple's lives in his whole life. And in developing couuntries more and more good doctors are heginning to serve the people. On the other hand, our foods are much better than before. A social investigation shows that people spend more mid more money on food instead of on clothing. That helps to make our bodies stronger.
From all the faet given above,we can see that developing countrles are becoming better and better, and people can gain health in developing countries.
1991年的研究说明从1960年以来，发展中国家人们的.寿命增加了，婴儿死亡率下降了。
从图表上可以看到，1960年寿命是40岁，1990年是60岁左右。从图表上还可以看出，1960年1000名出生儿中死亡人数约200人，到1990年降低到了100人以下。
造成变化的原因是多种多样的。一方面，医疗服务比以前好。新的统计资料表明一名好医生在一生中能救活1000人的生命。在发展中国家越来越多的好医生正在为人民服务。另一方面，我们的食物比过去好得多。社会调查说明人们把越来越多的钱花在食品上，而不是衣物上。这有助于增强我们的体质。
从上面所提到的事实，我们可以看到发展中国家正在变得越来越好，人民能够增进健康。
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