The 2017 Global Age Watch Index（全球年龄指数）, which ranks 96 nations on the quality of life for the elderly, recently stated that by 2050, the number of over 60s will be 21 percent of the global population. This is almost double the current figure of 12 percent. The percentage of over-80s is growing fastest, too --- expected to rise from two percent now to four percent of the global population by 2050.

　　While it could take years of research to extend humans’ lives, the study raises the possibility of anti-ageing treatments in a new way, according to Dr Kapahi.

　　The research, reported in the journal Cell Reports, may explain why it has proved so difficult to identify single genes(基因) responsible for the long lives enjoyed by humans. “It’s quite probable that interactions between genes are critical in those fortunate enough to live very long, healthy lives,” said Dr Kapahi. Future research is expected to use mice to see if the same effects occur in mammals.

　　21.How many years can man live according to Colin Blakemore?

　　A. 120 years

　　B. 200 years

　　C. 130 years

　　D. 150 years

　　22. The underlined word “prolonging” in Paragraph 2 probably means_____.

　　A. limit

　　B. enjoy

　　C. shorten

　　D. lengthen

　　23.According to the passage, we can know_____.

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