文章大意：这是一篇说明文。皮尤研究中心的一份报告称，到2050年，全球65岁以上人口数量将是现在的三倍，这将改变一些国家的人口构成。老年人多于年轻人的情况肯定会对世界产生影响，文章主要对人口老龄化将会带来的影响进行了说明。
1 . 阅读下面材料，在空白处填入1个适当的单词或括号内单词的正确形式。
There’s one thing 1 certain — we’re all getting older. But, growing old 2 (graceful) is no bad thing. And with age comes wisdom. However, as the world population ages, will there be enough people to replace our younger selves?
A situation 3 there are more old people than young certainly has 4 effect on the world. A report by the Pew Research Center says that globally the number of people over 65 years will be three times by 2050, 5 (change) some countries’ demographic make-up (人口构成).
This growing and dependent population means that there is an increased demand for health and social care. Governments will struggle to provide satisfactory pensions (养老金), which 6 (fund) by taxes paid by the working population. And long-term, a smaller population of economically-active people may be a problem for 7 (company) trying to hire staff.
Attitudes to an ageing population vary around the world. The Pew Research Center survey found that 87% of Japanese people were most concerned about it, while only 26% of people from the USA were. Here, immigration is helping in order 8 (make) the younger workforce larger and stronger. Some countries thought the elderly should take care of 9 (they), while others thought it was the 10 (responsible) of the family. Many thought the government should be responsible.
