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Most children with healthy appetites are ready to eat almost anything that is offered them and a ...
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根据下列短文内容在短文后的空格处填上一个恰当的词使短文完整通顺Whatcanyoudotokeeph
Mostchildrenwithhealthyappetitearereadytoeatalmost
if
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AcrosstheUnitedStatesscientistsaremountingwhatmaybecomethemostinnovativeagriculturalresearchdrivesincethe1920swhenhybridcornwasdeveloped.SurprisinglythenewgeneticrevolutionisnottakingplaceinAmerica’sfields.Insteaditisoccurringinbiologylaboratoriesforitinvolvesthedeliberatemanipulationintesttubesofthegenesofcropplants.Thisgeneticengineeringmayprovethebiggestboontoagriculturesinceplantbreedingbegan. Thenewconceptsgrewoutofthebioengineeringofbacteriafortheproductionofsuchthingsashumanhormonesandvaccinesforviraldiseases.Plantcellshoweverarefarmorecomplexthanbacteriaanditwillprobablytakemanyyearsfortoday’sencouraginglaboratoryresultstohaveamajorimpactonthefarm.Infactthepayoffmaynotcomeuntilthenextcentury. Butalthoughbiotechnologistsarestillintheearliestphasesofthisnewfieldofsciencetheyarealreadyactivelyexploringwaystoredesignplantssotheywillusesunlightmoreefficientlyresistvirusesandotherpestsgrowinhotordryareasinsalinesoilsorinthepresenceofpesticidesandperhapsevenmaketheirownfertilizeroutofnitrogenintheair.Inadditionscientistshavehadearlysuccessinmakingwhollynewplantsthatareunavailablebyconventionalplantbreeding--apotato-tomatocombinationforexample. Thenewtechnologyholdsthepromiseofvirtuallylimitlesshorizonsinfoodproduction.Onlyimaginationsetsthelimits:frost-resistantwheattropicalpotatoessaltwaterriceaplantproducingacombinationofapeaandacarrot--allmaybewithusoneday. Whatisthemaintopicofthispassage
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Whenthetemperatureofaliquidisraisedenoughtheliquidboils.Thismeansthatbubblesofvaporcontainingmillionsofmoleculesformbelowthesurface.Inorderforsuchbubblestobeproducedthepressureofthevaporinsidethemmustbeequaltothepressureoftheairuponthesurfaceoftheliquid.Iftheairpressureisgreaterthebubblewillcollapse.Theboilingpointofaliquidthenisthetemperatureatwhichthevaporpressureoftheliquidisequaltotheatmosphericpressureupontheliquidatthesurface. Thepressureoftheatmosphereatsealevelisaboutonekilogrampersquarecentimeter.Wecallthispressureoneatmosphere.Theboilingpointofaliquidthereforeisthetemperatureatwhichitsvaporpressureequalsoneatmosphere.Theboilingpointofwateris100Celsius;ofethylalcohol78.5Celsius;ofmercury356.9Celsius. Ifthepressureonthesurfaceofthewaterisreducedtheboilingpointwillbelower.Nowthehigherupwegofromsealevelthelowertheatmosphericpressurebecomessincethereislessairtopressuponus.Hencewhilewaterboilsatsealevelatatemperatureof100Celsiusitsboilingpointonamountainthreekilometershighisonly90Celsius.Sincethetemperatureofwaterdoesnotriseasaresultofboilingitwouldtakeyoulongertocookpotatoesorcarrotsinboilingwateronthemountainthanitwouldatsealevel. Theliquidboilsonlywhen
SteamshipswerefirstintroducedintotheUnitedStatesin1807andJohnMoisonbuiltthefirststeamshipinCanadathencalledBritishNorthAmericain1809.Bythe1830sdozensofsteamvesselswereinuseinCanada.Theyofferedthetravelerreliabletransportationincomfortablefacilities--awelcomealternativetostagecoachtravelwhichatthebestoftimescouldonlybedescribedaswretched.Thiscommitmenttodependablerivertransportbecameentrenchedwiththeinvestmentofmillionsofdollarsfortheimprovementofwaterwayswhichincludedtheconstructionofcanalsandlocksystems.TheLachineandWellandCanalstwoofthemostimportantsystemswereopenedin1825and1829respectively.BythetimethatUpperandLowerCanadawereunitedintotheProvinceofCanadain1841thepublicdebtforcanalswasmorethanonehundreddollarspercapitaanenormoussumforthetime.ButitmaynotseemsuchagreatamountifweconsiderthatimprovementsallowedsteamboatstoremainpracticalformostcommercialtransportinCanadauntilthemid-nineteenthcentury. Whatisthemainpurposeofthepassage
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SteamshipswerefirstintroducedintotheUnitedStatesin1807andJohnMoisonbuiltthefirststeamshipinCanadathencalledBritishNorthAmericain1809.Bythe1830sdozensofsteamvesselswereinuseinCanada.Theyofferedthetravelerreliabletransportationincomfortablefacilities--awelcomealternativetostagecoachtravelwhichatthebestoftimescouldonlybedescribedaswretched.Thiscommitmenttodependablerivertransportbecameentrenchedwiththeinvestmentofmillionsofdollarsfortheimprovementofwaterwayswhichincludedtheconstructionofcanalsandlocksystems.TheLachineandWellandCanalstwoofthemostimportantsystemswereopenedin1825and1829respectively.BythetimethatUpperandLowerCanadawereunitedintotheProvinceofCanadain1841thepublicdebtforcanalswasmorethanonehundreddollarspercapitaanenormoussumforthetime.ButitmaynotseemsuchagreatamountifweconsiderthatimprovementsallowedsteamboatstoremainpracticalformostcommercialtransportinCanadauntilthemid-nineteenthcentury. AccordingtothepassagesteamshipsbecamepracticalmeansoftransportationinCanadabecauseof
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