蝦說閱讀作業(yè)1正課課堂句子

7句子題判斷文以及上下文之間的:代詞,,關(guān)系(詞)以后,文章會(huì)變得更加通暢.Abovethetreel hereisazhatisgenerallycalledalpundra.{■}Immediayadjacenttothetimberline,thetundraconsistsofafairlycompletecoveroflow-lyingshrubs,herbs,andgrasses,whilehigherupthenumberanddiversityofspeciesdecreaseuntilthereismuchbaregroundwithoccasionalmossesandlichensandsomeprostratecushionnts.{■}Some ntscanevensurviveinfavorablemicrohabitatsabovethesnowline.Thehighest ntsintheworldoccurataround6,100metersonMakaluintheHimalayas.{■}Atthisgreatheight,rocks,warmedbythesun,meltsmallsnowdrifts.{■}Thiinshow,forexample,alpinecushionntshavebeenfoundgrowingatanaltitudeof6,180meters.{■}Theraisingoflivestockisamajoreconomicactivityinsemiaridlands,wheregrassesaregenerallythedominanttypeofnaturalvegetation.{■}Theconsequencesofanexcessivenumberoflivestockgrazinginanareaarethereductionofthevegetationcoverandthetramplingandpulverizationofthesoil.{■}Thisisusuallyfollowedbythedryingofthesoilandacceleratederosion.{■}Thiseconomicrelianceonlivestock ertainregionsmakeslargetractsoflandsusceptibletoovergrazing. tbutalreadyfullymarinecetaceansareknownfromthefossilrecord.{■}Howwasthegapbetweenawalkingm landaswimmingwhalebridged?{■}Missinguntilrecentlywerefossilsclearlyintermediate,ortransitional,betweenlandm andcetaceans.{■}Veryexcitingdiscoverieshavefinallyallowedscientiststoreconstructthemostlikelyoriginsofcetaceans.{■}In1979,ateamlookingforfossilsinnorthernPakistanfoundwhatprovedtobetheoldestfossilwhale.ThefossilwasofficiallynamedPakicetusinhonorofthecountrywherethediscoverywasmade.Pakicetuswasfoundembeddedinrocksformedfromriverdepositsthatwere52millionyearsold.Thisisaquestionthathaspuzzledscientistsfor{■}Exhibitors,however,wantedtoizetheirprofits,whichtheycoulddomorereadilybyprojectingahandfuloffi tohundredsofcustomersatatime(ratherthanoneatatime)andbycharging25to50centsadmission.{■}AboutayearaftertheopeningofthefirstK oscopeparlorin1894,showmensuchasLouisandAugusteLumiere,ThomasArmatandCharlesFrancisJenkins,andOrvilleandWoodvilleLatham(withtheassistanceofEdison'sformerassistant,WilliamDickson)perfectedprojectiondevices.{■}Theseearlyprojectiondeviceswereusedinvaudevilletheaters,legitimatetheaters,localtownhalls,makeshiftstorefronttheaters,fairgrounds,andamusementparkstoshowfi toamassaudience.{■}WhenthiswidespreaduseofprojectiontechnologybegantohurthisKoscopebusiness,EdisonacquiredaprojectordevelopedbyArmatandintroduceditas“Edison’slatestmarvel,theVitascope."{■}Modernarchitecturalformsgenerallyhavethreeseparatecomponentscomparabletoelementsofthehumanbody;asupportingskeletonorframe,anouterskinenclosingtheinteriorspaces,equipment,similartothebody’svitalorgansandsystems.{■}Theequipment ludesplumbing,electricalwiring,hotwater,andair-conditioning.{■}Ofcourseinearlyarchitecture—suchasigloosandadobestructures—therewasnosuchequipment,andtheskeletonandskinwereoftenone.However,somemodernarchitecturaldesigns,suchasthoseusingfoldedtesofconcreterorair-inflatedstructures,areagainunifyingskeletonandskin.ThereactionoffarmerstotheinevitabledepletionoftheOgallalavaries.Manyhavebeenattemptingtoconservewaterbyirrigatinglessfrequentlyorbyswitchingtocropsthatrequirelesswater.{■}Other,however,haveadoptedthephilosophythatitisbesttousethewaterwhileitisstilleconomicallyprofitabletodosoandtoconcentrateonhigh-valuecropssuchascotton.{■}The entiveofthefarmerswhowishtoconservewaterisreducedbytheirknowledgethatmanyoftheirneighborsareprofitingbyusinggreatamountsofwater,andintheprocessaredrawingdowntheentireregion’swaters.Inthefaceoftheupcomingwatersupplycrisis,anumberofgrandioseschemeshavebeendevelopedtotransportvasttiesofwaterbycorpipelinefromtheMississippi,theMissouri,ortheArkansasrivers.{■}Unfortunay,thecostofwaterobtainedthroughanyoftheseschemeswould reasepumcostsatleasttenfold,makingthecostofirrigatedagriculturalproductsfromtheregionuncompetitiveonthenationalandinternationalmarkets.Butevenifuncooperativefarmersweretojoinintheconservationefforts,thiswouldonlydelaythedepletionoftheaquifer.{■}Ecologistsareespeciallyinterestedtoknowwhatfactorscontributetotheresilienceofcommunitiesbecauseclimaxcommunitiesallovertheworldarebeingseverelydamagedordestroyedbyhumanactivities.{■}ThedestructioncausedbythevolcanicexplosionofMountSt.Helens,inthenorthwesternUnitedStates,forexample,palesincomparisontothedestructioncausedbyhumans.{■}Weneedtoknowwhataspectsofacommunityaremostimportanttothecommunity’stodestruction,aswellasitsrecovery.{■}Infact,damagetotheenvironmentbyhumansisoftenmu oreseverethandamagebynaturaleventsandprocesses.Whatkeepstheblack-taileddeeraliveintheharsherseasonsofntdecayanddormancy?Onecompensationfornothibernatingisthebuilt-inurgetomigrate.{■}Deermaymovefromhigh-elevationbrowseareasinsummerdowntothelowlandareasinlatefall.{■}Evenwithsnowontheground,thehighbushyunderstoryisexposed;alsosnowandwindbringdownleafybranchesofcedar,hemlock,redalder,andotherarborealfodder.{■}Thenumbersofdeerhavefluctuatedmarkedlys etheentryofEuropeansintoPugetSoundcountry.{■}Theearlyexplorersandsettlerstoldofabundantdeerintheearly1800sandyetalmostinthesamebreathbemoanedthelackofthissucculentgameanimal.TherefoodisavailableandaccessiblethroughouttheAnotherexnationforthefocusonanimalsmightbethatthesepeoplesoughttoimprovetheirluckathunting.{■}Thistheoryissuggestedbyevidenceofchipsinthepaintedfigures,perhapsmadebyspearsthrownatthedrawings.{■}Butifimprovingtheirhuntingluckwasthechiefmotivationforthepaintings,itisdifficulttoexinwhyonlyafewshowsignsofhavingbeenspeared.{■}Perhapsthepaintingswereinspiredbytheneedto reasethesupplyofanimals.CaveartseemstohavereachedapeaktowardoftheUpperPaleolithicperiod,whentheherdsofgameweredecreasing.{■}Therefore,ifthepaintin