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had major disturbance.The more similar the secondary forests were to their neighboring old-growthforests,reasoned the researchers,the more they had recovered.The team found that after 20 years,the average secondary forest that had grown from farmlandthat was used with low to medium intensity()had recovered 78%of old-growth forestattributes(属性).“It goes way faster than we thought,,”says Poorter.But the researchers found significant discrepancy between the recovery time for the differentforest attributes.Soils were the quickest to bounce back,with most recovery happening within 10years.It took 25-60 years for plant species diversity to recover.Despite the enormous amount of deforestation that has and continues to occur,there's hopethat these forests can bounce back naturally,says Poorter.Secondary forests currently make up over28%of tropical forests in Central and South America,and are important for locking up carbonwhich is important to deal with climate change.In addition,they attract mammals,birds and insectsback to the area,which is important for ecosystem restoration."These results are promising,"says J.Leighton Reid at Virginia Tech."However,the sites inthis study don't represent regeneration on the average piece of deforested land,and many deforestedsites will recover much more slowly than the ones studied here.32.Why did the researchers contrast secondary forests with nearby old-growth forests?A.To measure the recovery of secondary forests.B.To detect threats to secondary forests.C.To learn more about forest attributes.D.To determine the contributing factors of forest recovery.33.What does the underlined word"discrepancy"mean in Paragraph 5?A.Link.B.Dependence.C.Difference.D.Similarity.34.What is a hopeful phenomenon according to Poorter?A.Fewer tropical forests are being deforested.B.Ecosystem restoration is happening in forestsC.The survey covers a representative sample of sitesD.A quarter of America is covered by secondary forests.35.What did the research team find about tropical forests?A.They went hand in hand with the ecosystem restoration.B.They featured secondary forests that could recover themselves.C.They could re-establish themselves quickly on abandoned land.D.They were often abandoned after being deforested for agriculture.第二节（共5小题；每小题2.5分，满分12.5分）根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。Rock climbing is the kind of sport you either love or you're simply not interested in.For thosewho love it,there is great personal satisfaction.36 It is a physical workout that requiresstrength,coordination,and perseverance.Regular climbing(2 or more times per week)can improvecardiovascular fitness,muscle strength,and flexibility.Mentally,you must confront(IE)yourfears both of injuries and of heights and make good decisions because your life depends upon it.英语试卷第6页共11页