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27.Which of the following best deseribes Nikki?A.Generous.B.Demanding.C.Ambitious.D.Caring.For the first time,scientists have provided clear evidence that tropieal reeaVo01日lifespans decrease above a critical temperature threshold.Findingspublished in theo Proceedings of the Nation Academy of nhothat across the tropics,tree lifespans decrease for temperatures above 25C.As temperatures are rising rapidly across large parts of the tropics,the treedeath rate is likely to rise in most parts of the tropics,including the Amazon,Pantanal and Atlantic forests,with possible effects on animal habitats,airquality and carbon stocks.Although tropical rainforests account for only 7%ofall land,they are home to about 50%of all animals and plant species,andapproximately 50%of forest carbon stocks on earth.Thus,small changes in thefunctioning of tropical forests can significantly change the atmospheric levels ofCO2-the most important greenhouse gas caused by humans.Professor Manuel Gloor and Dr Roel Brienen,the Leeds School ofGeography,are co-authors of the new study.Professor Gloor said:"Manyregions in the tropics are heating up particularly rapidly and a large number ofareas will become warmer,on average,than approximately 25C.Our findingssuggest that for trees in these regions,their lifespans are likely to be negativelyaffecicd”德文化Dr Brienen added,"This indicates that tropical forests may be morevulnerable(易受伤害的)to increasing heat than previously thought,.As a resultof globalarming,we therefore expeet the shortening of tree lifespans in thetropics.These results are a warning sign that,along with deforestation,globalwarming puts extra stress on the Earth's tropical forests."The research team,led by Dr Giuliano Locosselli,from the Institute ofBioscienees,University of Sao Paulo,Brazil,spent four years examining treerising data from more than1000 trees worldwide belongingtdifferen英语试题（雅礼版）第7页（共16页）