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.第一段不必寫太多，2個(gè)長(zhǎng)句即可。主體段才是加分段。

2.第一句寫出復(fù)合背景句，第二句亮出自己觀點(diǎn)。注意要對(duì)題目用詞的替換。

3.練習(xí)中，我們可以多寫一些。以應(yīng)變考場(chǎng)的相似題目。