The first paragraph:
Technological and scientific breakthrough and the increasing personal healthy insurance have contributed to the improvement of the life expectancy. Many countries have seen their population aging at an unprecedented pace.Although the older generation can play an important role in the social life to some extent, I believe that this demographic change could cause a number of social issues. The problems of this demographic change far overweigh its positive impact.
Tips：
1.第一段不必写太多，2个长句即可。主体段才是加分段。
2.第一句写出复合背景句，第二句亮出自己观点。注意要对题目用词的替换。
3.练习中，我们可以多写一些。以应变考场的相似题目。
