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¹Peopleare more likely to live long enough to get old in wealthy countries than inpoor countries. ²In rich countries people have nutritiousfood modern medical care good sanitation and clean drinking water but poorcountries lack these things. ³As a result the mortality rateespecially infant mortality is very high. 4Citizens of Ethiopia andYemen which are two of the world’s poorest countries have an average lifeexpectancy of 35-39 years. 5Citizens of Japan Hong Kong SingaporeAustralia Iceland and Sweden in contrast have an average life span of more than80 years. 6Japan has the highest Yemen has the lowest. 7Oneexception is Saudi Arabia one of the world’s wealthiest nations. 8Havingan average life expectancy of 45-49 years Saudi Arabians live about as long asBangladeshis and Cambodians. 9Surprisingly the United States is notamong the highest rated nations having an average life expectancy of only 77years.
10Comparedto other mammals humans have a relatively long life span. 11Theaverage life span of elephants is 70 years of dogs 18 years of cats 14 yearsand of horses 20 years. 12The life spans of other species are asfollows eagles parrots and owls 60 years parakeets 12 years guppies 5 years andbox tortoises 100 years. 13Some plants such as trees live muchlonger than animals. 14Redwood trees for example live more than 3,000years and bristlecone pine trees can live over 4000 years.
谁知道啊~！~~