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3英语试题)
A deep time perspective improves conservationefforts.But how can we know what an ecosystem(A)9.What does the underlined word "merged"inlooked like 100 or 1,000 years ago?One pathway isparagraph 3 probably mean?读through mathematical modeling.Recently scientistsA.Combined.读have discovered a possible way to preserve theB.Reserved.ecosystem of California's kelp(大型褐藻)forest.C.Expanded.Over the past decade,kelp forests have lost moreD.Crowded.than 90%of their historical range.One factor is theincrease of kelp-consuming sea urchins(海胆).g(A)10.What does the case of Henderson show?After their enemies,sea otters and sunflower seaA.Plastic trash is affecting the environmentstars,were pushed to near extinction by 19th-globally.century fur trading and a 2014 ocean warming读B.The natural ecosystem has become读event,sea urchins increased unchecked.Throughextremely delicate.modeling,scientists examined how North PacificC.Remoteness protects islands from humankelp forests existed long before the 19th centuryintervention.and found they had ignored a species'role inD.Disposable plastic items should be got ridmaintaining the harmony of this ecosystem.gof completely.(D)11.What would be the best title for the text?The Steller's sea cow lived in near-shoreA.Be careful!Plastic trash is taking over themarine settings throughout much of the PacificRim.They filled their bellies with fronds(藻体)planetfrom the upper kelp.This allowed light to reach the读B.Plants and birds on Henderson Island are读sea bottom,promoting growth not only of kelp,butendangeredof other kinds of organisms as well.In re-creatingC.The ocean has become a gathering placethe disappeared historical system that included thefor plastic trashSteller's sea cow through modeling,scientists couldD.A distant island is the most plastic-litteredsee a forest with varied species that competedplace on Earthbetter with kelp.DSo,rather than focusing on removing sea urchinsor reintroducing sea otters,we might considerAs the climate and biodiversity crises worsen,selectively harvesting kelp fronds,as the Steller's圜we are urgently working to protect and regeneratesea cow once did,to allow light to encourage freshecosystems without understanding how they读growth in these underwater forests.functioned when they were truly thriving )Similar modeling studies should be applied toIndeed,most conservation efforts today generallyother conservation efforts.In short,deep time andconsider timescales of a century or less.This mayan understanding of past ecosystems couldcause problems.significantly change how we carry out conservation,work.For decades,forest management practices throughoutthe Sierra Nevada tried to put out even the mildest forest(C12.Why does the author mention forest fires infires,based on the persistent belief that fire was bad forparagraph 1?both people and nonhuman nature.These practicesA.To show the influence of forest fires.读resulted in the thick trees that have fueled damaging读B.To show the importance of protectingwildfires.Until recently we ignored the forestforests.management strategies Indigenous communities hadC.To show the fault in humans'conservationsuccessfully used for a thousand years,especially smallefforts.controlled burns.Fire,it turns out,has always been anD.To show the challenges in environmentalimportant part in healthy forest ecosystems,promotingprotection.new growth and enriching the soil.3
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