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A.To look for readers'answer.B.To introduce the topicC.To keep a sense of mystery.D.To show off his knowledge.29.What is Paragraph 2 mainly about?A.Why the study started.B.How the study was done.C.How many people joined in the study.D.What conclusion the researchers made30.What should be stressed in school education according to the author?A.Previewing-by-teaching.B.Note-taking.C.Learning-by-teaching.D.Mind-mapping.31.Where is the text probably from?A.A history textbook.B.A newspaperC.A guideline.D.A detective novel.DUp to one fifth of the Amazon rainforest is emitting more carbon dioxide (CO2),than itabsorbs,new research suggests.Results from a decade-long study of greenhouse gases over theAmazon rainforest appear to show around 20%of the total area has become a net source ofCO2 in the atmosphere.One of the main causes is deforestation.While trees are growing,theyabsorb CO from the atmosphere;dead trees release it again.However,the fact is that millionsof trees have been lost to logging and fires in recent years.The results of the study,which have not yet been published,have implications for the effortto combat climate change.They suggest that the Amazon rainforest,a vital carbon "store",or"sink",that slows the pace of global warming may be turning into a carbon source faster thanpreviously thought.Every two weeks for the past 10 years,a team of scientists led by ProfessorLuciana Gatti,a researcher at Brazil's National Institute for Space Research (INPE),has beenmeasuring greenhouse gases by flying aireraft fitted with sensors over different parts of theAmazon basin.What the group found was startling:while most of the rainforest still retains itsability to absorb large quantities of COz-especially in wetter years-one portion of theforest,which is especially heavily deforested,appears to have lost that capacity.Gatti'sresearch suggests this south-eastern part of the forest,about 20%of the total area,has become a carbon source."Each year is worse,"she told Newsnight."We observed that thisarea in the sout-ast isan imporant sour ofabo.And it doesnmatter whetheritisawetyear or a dry year.2017 was a wet year,but it didn't make any difference."Aforest can becomea soure of cabon rather than asorwhen treesdieand英语试题第7页共12页
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