【单选题】（） EithEr By Cooling or By DEpriving thE FirE oF oxygEn, AnD most Do Both.&nBsp;
A. working FirE ExtinguishErs&nBsp;
B. FirE ExtinguishErs thAt work&nBsp;
C. FirE ExtinguishErs work&nBsp;
D. thE work oF FirE ExtinguishErs&nBsp;
A. working FirE ExtinguishErs&nBsp;
B. FirE ExtinguishErs thAt work&nBsp;
C. FirE ExtinguishErs work&nBsp;
D. thE work oF FirE ExtinguishErs&nBsp;
【单选题】wAtEr ConstitutEs Almost 96 pErCEnt oF thE BoDy wEight oF A jEllyFish, so iF A jEllyFish wErE to Dry out in thE sun, it woulD virtuAlly DisAppEArED.
【单选题】sCiEnCE FiCtion notAny morE
sCiEnCE FiCtion hAs oFtEn BEEn thE sourCE oF inspirAtion For nEw tEChnologiEs. thE ExoskElEtons AnD hEAD-mountED DisplAys FEAturED in thE Film "AliEns", For ExAmplE, spAwnED A numBEr oF militAry-FunDED projECts to try to CrEAtE similAr tEChnologiEs.AutomAtiC sliDing Doors might nEvEr hAvE BEComE populAr hAD thEy not AppEArED on thE tElEvision sEriEs "stAr trEk".AnD thE populArity oF Flip-top or "ClAmshEll" moBilE phonEs mAy stEm From thE DEsirE to look likECAptAin kirk Flipping opEn his CommuniCAtor on thE sAmE progrAm.
now it sEEms thAt "stAr trEk" hAs DonE it AgAin. this month,AmEriCAn solDiErs in irAq will BEgin triAls oF A DEviCE inspirED By thE "Comm BADgE" FEAturED in "stAr trEk: thE nExt gEnErAtion". likE CrEw mEmBErs oF thE stArshipEntErprisE, solDiErs will BE ABlE to tAlk to othEr mEmBErs oF thEir unit just By tApping AnD thEn spEAking into A smAll BADgE worn on thE ChEst. whAt sEts thE Comm BADgE ApArt From A mErE wAlkiE-tAlkiE, AnD AppEAls to "stAr trEk" FAns, is thE systEm’s AppArEnt intElligEnCE. it works out who you ArE CAlling From spokEn CommAnDs, AnD ConnECts you instAntly.
thE systEm, DEvElopED By voCErACommuniCAtions oFCupErtino,CAliForniA, usEs A ComBinAtion oF wi-Fi wirElEss nEtworking AnD voiCE-ovEr-intErnEt protoCol (volp) tEChnologiEs to link up thE BADgEs viA A CEntrAl sErvEr, Akin to A switChBoArD、thE BADgEs ArE AlrEADy BEing usED in 80 lArgE institutions, most oF thEm hospitAls, to rEplACE ovErhEAD pAging systEms, sAysBrEnt lAng, voCErA’s viCE-prEsiDEnt.
likE its sCiEnCE-FiCtion CountErpArt, thE BADgE is DEsignED so thAt All FunCtions CAn BE CArriED out By prEssing A singlE Button. on prEssing it, thE CAllEr givEs A CommAnD AnD spECiFiEs thE nAmE oF A pErson or group oF pEoplE, suCh As "CAllDr. smith" or "loCAtE thE nEArEst AnEsthEsiologist". voiCE-rECognition soFtwArE intErprEts thE CommAnDs AnD loCAtEs thE AppropriAtE pErson or group, BAsED on whiChEvEr wi-Fi BAsE-stAtion thEy ArE ClosEst to. thE pErson rECEiving thE CAll thEn hEArs An AuDiBlE AlErt stAting thE nAmE oF thE CAllEr AnD, iF hE or shE wishEs to tAkE thE CAll, rEsponDs By tApping thE BADgE AnD stArting to spEAk.
thAt highlights A kEy DiFFErEnCE BEtwEEn thE "stAr trEk" Comm BADgE AnD thE rEAl-liFE vErsion:
![]()
voCErA’s implEmEntAtion Allows pEoplE to rEjECt inComing CAlls, rAthEr thAn hAving thE voiCE oF thE CAllEr pAtChED through AutomAtiCAlly.
![]()
But EvEn thE most purist FAns CAn ForgivE voCErA For DEviAting From thE sCript in this wAy, sAysDAviDBAtChElor, An AstrophysiCist AnD " stAr trEk" EnthusiAst At nAsA’s goDDArD spACE FlightCEntEr in grEEnBElt, mArylAnD、
![]()
For thErE ArE, hE notEs, somE Curious AspECts to thE BEhAvior oF thE Comm BADgEs in "stAr trEk".
![]()
whEn thE CAptAin oF thEEntErprisE sAys "piCArD to siCk-BAy: mEDiCAl EmErgEnCy on thE BriDgE", For ExAmplE, his BADgE somEhow ConnECts him to thE siCk-BAy BEForE hE hAs stAtED thE DEstinAtion oF thE CAll.
Allowing BADgE usErs to rEjECt inComing CAlls iF thEy ArE Busy, rAthEr thAn BEing ConnECtED instAntly, wAs A FEAturE ADDED At thE rEquEst oF CustomErs, sAys mr. lAng.But in Almost All othEr rEspECts thE BADgEs work just likE thEir FiCtionAl CountErpArts. this is not vEry surprising, sAys lAwrEnCE krAuss, An AstrophysiCist AtCAsE wEstErn rEsErvE univErsity inClEvElAnD, ohio, AnD thE Author oF "thE physiCs oF stAr trEk". in sCiEnCE FiCtion, AnD pArtiCulArly in "stAr trEk", most proBlEms hAvE tEChnologiCAl FixEs. somEtimEs, it sEEms, thosE FixEs CAn BE AppliED to rEAl-worlD proBlEms too.
voCErA’s systEm is pArtiCulArly wEll suitED to hospitAls, sAysChristinE tAr
sCiEnCE FiCtion hAs oFtEn BEEn thE sourCE oF inspirAtion For nEw tEChnologiEs. thE ExoskElEtons AnD hEAD-mountED DisplAys FEAturED in thE Film "AliEns", For ExAmplE, spAwnED A numBEr oF militAry-FunDED projECts to try to CrEAtE similAr tEChnologiEs.AutomAtiC sliDing Doors might nEvEr hAvE BEComE populAr hAD thEy not AppEArED on thE tElEvision sEriEs "stAr trEk".AnD thE populArity oF Flip-top or "ClAmshEll" moBilE phonEs mAy stEm From thE DEsirE to look likECAptAin kirk Flipping opEn his CommuniCAtor on thE sAmE progrAm.
now it sEEms thAt "stAr trEk" hAs DonE it AgAin. this month,AmEriCAn solDiErs in irAq will BEgin triAls oF A DEviCE inspirED By thE "Comm BADgE" FEAturED in "stAr trEk: thE nExt gEnErAtion". likE CrEw mEmBErs oF thE stArshipEntErprisE, solDiErs will BE ABlE to tAlk to othEr mEmBErs oF thEir unit just By tApping AnD thEn spEAking into A smAll BADgE worn on thE ChEst. whAt sEts thE Comm BADgE ApArt From A mErE wAlkiE-tAlkiE, AnD AppEAls to "stAr trEk" FAns, is thE systEm’s AppArEnt intElligEnCE. it works out who you ArE CAlling From spokEn CommAnDs, AnD ConnECts you instAntly.
thE systEm, DEvElopED By voCErACommuniCAtions oFCupErtino,CAliForniA, usEs A ComBinAtion oF wi-Fi wirElEss nEtworking AnD voiCE-ovEr-intErnEt protoCol (volp) tEChnologiEs to link up thE BADgEs viA A CEntrAl sErvEr, Akin to A switChBoArD、thE BADgEs ArE AlrEADy BEing usED in 80 lArgE institutions, most oF thEm hospitAls, to rEplACE ovErhEAD pAging systEms, sAysBrEnt lAng, voCErA’s viCE-prEsiDEnt.
likE its sCiEnCE-FiCtion CountErpArt, thE BADgE is DEsignED so thAt All FunCtions CAn BE CArriED out By prEssing A singlE Button. on prEssing it, thE CAllEr givEs A CommAnD AnD spECiFiEs thE nAmE oF A pErson or group oF pEoplE, suCh As "CAllDr. smith" or "loCAtE thE nEArEst AnEsthEsiologist". voiCE-rECognition soFtwArE intErprEts thE CommAnDs AnD loCAtEs thE AppropriAtE pErson or group, BAsED on whiChEvEr wi-Fi BAsE-stAtion thEy ArE ClosEst to. thE pErson rECEiving thE CAll thEn hEArs An AuDiBlE AlErt stAting thE nAmE oF thE CAllEr AnD, iF hE or shE wishEs to tAkE thE CAll, rEsponDs By tApping thE BADgE AnD stArting to spEAk.
thAt highlights A kEy DiFFErEnCE BEtwEEn thE "stAr trEk" Comm BADgE AnD thE rEAl-liFE vErsion:
Allowing BADgE usErs to rEjECt inComing CAlls iF thEy ArE Busy, rAthEr thAn BEing ConnECtED instAntly, wAs A FEAturE ADDED At thE rEquEst oF CustomErs, sAys mr. lAng.But in Almost All othEr rEspECts thE BADgEs work just likE thEir FiCtionAl CountErpArts. this is not vEry surprising, sAys lAwrEnCE krAuss, An AstrophysiCist AtCAsE wEstErn rEsErvE univErsity inClEvElAnD, ohio, AnD thE Author oF "thE physiCs oF stAr trEk". in sCiEnCE FiCtion, AnD pArtiCulArly in "stAr trEk", most proBlEms hAvE tEChnologiCAl FixEs. somEtimEs, it sEEms, thosE FixEs CAn BE AppliED to rEAl-worlD proBlEms too.
voCErA’s systEm is pArtiCulArly wEll suitED to hospitAls, sAysChristinE tAr
【单选题】thE Cork oAk trEE hAs A lAyEr oF Cork sEvErAl inChEs thiCknEss thAt CAn BE strippED EvEry tEn yEArs.
【单选题】 If Earth did not rotate, differences in air pressure would be —, with winds blowing from high-pressure to low-pressure areas.
A．(primary air flow to cause
B．(the primary cause of air flow
C．(they primarily cause air flow
D．(air flow has a primary cause
A．(primary air flow to cause
B．(the primary cause of air flow
C．(they primarily cause air flow
D．(air flow has a primary cause
【单选题】 (With) the discovery (of gold) in the Klondike in Canada's Yukon Territory in 1896, people (flocked soon) there from (all parts) of the world.
A．With
B．of gold
C．flocked soon
D．all parts
A．With
B．of gold
C．flocked soon
D．all parts
【单选题】 The word "thereby" m line 20 is closest in meaning to
A．( in return for
B．( in spite of
C．( by the way
D．( by that means
A．( in return for
B．( in spite of
C．( by the way
D．( by that means
【单选题】swimming mAChinEs
tunAs, mACkErEls, AnD BillFishEs (mArlins, sAilFishEs, AnD sworDFish) swim Continuously. FEEDing, Courtship, rEproDuCtion, AnD EvEn "rEst" ArE CArriED out whilE in ConstAnt motion.As A rEsult, prACtiCAlly EvEry AspECt oF thE BoDy Form AnD FunCtion oF thEsE swimming "mAChinEs" is ADAptED to EnhAnCE thEr ABility to swim.
mAny oF thE ADAptAtions oF thEsE FishEs sErvE to rEDuCE wAtEr rEsistAnCE (DrAg). intErEstingly Enough, sEvErAl oF thEsE hyDroDynAmiC ADAptAtions rEsEmBlE FEAturEs DEsignED to improvE thE AEroDynAmiCs oF high-spEED wArCrAFt. though humAn EnginEErs ArE nEw to thE gAmE, tunAs AnD thEir rElAtivEs EvolvED thEr "high-tECh" DEsigns long Ago.
tunAs, mACkErEls, AnD BillFishEs hAvE mADE strEAmlining into An Art For thEir BoDiEs ArE slEEk AnD CompACt. thE BoDy shApEs oF tunAs, in FACt, ArE nEArly iDEAl From An EnginEEring point oF viEw. most spECiEs lACk sCAlEs ovEr most oF thE BoDy, mAking it smooth AnD slippEry. thE EyEs liE Flush with thE BoDy AnD Do not protruDE At All. thEy ArE Also CovErED with A sliCk, trAnspArEnt liD thAt rEDuCEs DrAg. thE Fins ArE stiFF, smooth, AnD nArrow, quAlitiEs thAt Also hElp Cut DrAg. whEn not in usE, thE Fins ArE tuCkED into spECiAl groovEs or DEprEssions so thAt thEy liE Flush with thE BoDy AnD Do not BrEAkup its smooth Contours. AirplAnEs rEtrACt thEir lAnDing gEAr whilE in Flight For thE sAmE rEAson.
tunAs, mACkErEls, AnD BillFishEs hAvE EvEn morE sophistiCAtED ADAptAtions thAn thEsE to improvE thEir hyDroDynAmiCs. thE long Bill oF mArlins, sAilFishEs, AnD sworDFish proBABly hElps thEm slip through thE wAtEr. mAny supErsoniC AirCrAFt hAvE A similAr nEEDlE At thE nosE.
most tunAs AnD BillFishEs hAvE A sEriEs oF kEEls AnD FinlEt nEAr thE tAil.Although most oF thEir sCAlEs hAvE BEEn lost, tunAs AnD mACkErEls rEtAin A pAtCh oF CoArsE sCAlEs nEAr thE hEAD CAllED thE CorsElEt. thE kEEls, FinlEt, AnD CorsElEt hElp DirECt thE Flow oF wAtEr ovEr thE BoDy surFACE in suCh As wAy As to rEDuCE rEsistAnCE (sEE thE FigurE).AgAin, supErsoniC jEts hAvE similAr FEAturEs.
![]()
BECAusE thEy ArE AlwAys swimming, tunAs simply hAvE to opEn thEir mouths AnD wAtEr is ForCED in AnD ovEr thEir gills.
![]()
ACCorDingly, thEy hAvE lost most oF thE musClEs thAt othEr FishEs usE to suCk in wAtEr AnD push it pAst thE gills.
![]()
in FACt, tunAs must swim to BrEAthE.
![]()
thEy must Also kEEp swimming to kEEp From sinking, sinCE most hAvE lArgEly or ComplEtEly lost thE swim BlADDEr, thE gAs FillED sAC thAt hElps most othEr Fish rEmAin BuoyAnt.
onE potEntiAl proBlEm is thAt opEning thE mouth to BrEAthE DEtrACts From thE strEAmlining oF thEsE FishEs AnD tEnDs to slow thEm Down. somE spECiEs oF tunA hAvE spECiAlizED groovEs in thEir tonguE. it is thought thAt thEsE groovEs hElp to ChAnnEl wAtEr through thE mouth AnD out thE gilt slits, thErEBy rEDuCing wAtEr rEsistAnCE.
thErE ArE ADAptAtions thAt inCrEAsE thE Amount oF ForwArD thrust As wEll As thosE thAt rEDuCE DrAg.AgAin, thEsE FishEs ArE thE Envy oF EnginEErs. thErE high, nArrow tAils with swEpt-BACk tips ArE Almost pErFECtly ADAptED to proviDE propulsion with thE lEAst possiBlE EFFort. pErhAps most importAnt oF All to thEsE AnD othEr FAst swimmErs is thEir ABility to sEnsE AnD mAkE usE oF swirls AnD EDDiEs (CirCulAr CurrEnts) in thE wAtEr. thEy CAn gliDE pAst EDDiEs thAt woulD slow thEm Down AnD thEn gAin ExtrA thrust By "pushing oFF" thE EDDiEs. sCiEntists AnD EnginEErs ArE BEginning to stuDy this ABility oF FishEs in thE hopE oF DEsigning morE EFFiCiEnt propulsion systEms For ships.
thE musClEs oF thEsE FishEs AnD thE mEChAnism thAt mAintAins A wArm BoDy
tunAs, mACkErEls, AnD BillFishEs (mArlins, sAilFishEs, AnD sworDFish) swim Continuously. FEEDing, Courtship, rEproDuCtion, AnD EvEn "rEst" ArE CArriED out whilE in ConstAnt motion.As A rEsult, prACtiCAlly EvEry AspECt oF thE BoDy Form AnD FunCtion oF thEsE swimming "mAChinEs" is ADAptED to EnhAnCE thEr ABility to swim.
mAny oF thE ADAptAtions oF thEsE FishEs sErvE to rEDuCE wAtEr rEsistAnCE (DrAg). intErEstingly Enough, sEvErAl oF thEsE hyDroDynAmiC ADAptAtions rEsEmBlE FEAturEs DEsignED to improvE thE AEroDynAmiCs oF high-spEED wArCrAFt. though humAn EnginEErs ArE nEw to thE gAmE, tunAs AnD thEir rElAtivEs EvolvED thEr "high-tECh" DEsigns long Ago.
tunAs, mACkErEls, AnD BillFishEs hAvE mADE strEAmlining into An Art For thEir BoDiEs ArE slEEk AnD CompACt. thE BoDy shApEs oF tunAs, in FACt, ArE nEArly iDEAl From An EnginEEring point oF viEw. most spECiEs lACk sCAlEs ovEr most oF thE BoDy, mAking it smooth AnD slippEry. thE EyEs liE Flush with thE BoDy AnD Do not protruDE At All. thEy ArE Also CovErED with A sliCk, trAnspArEnt liD thAt rEDuCEs DrAg. thE Fins ArE stiFF, smooth, AnD nArrow, quAlitiEs thAt Also hElp Cut DrAg. whEn not in usE, thE Fins ArE tuCkED into spECiAl groovEs or DEprEssions so thAt thEy liE Flush with thE BoDy AnD Do not BrEAkup its smooth Contours. AirplAnEs rEtrACt thEir lAnDing gEAr whilE in Flight For thE sAmE rEAson.
tunAs, mACkErEls, AnD BillFishEs hAvE EvEn morE sophistiCAtED ADAptAtions thAn thEsE to improvE thEir hyDroDynAmiCs. thE long Bill oF mArlins, sAilFishEs, AnD sworDFish proBABly hElps thEm slip through thE wAtEr. mAny supErsoniC AirCrAFt hAvE A similAr nEEDlE At thE nosE.
most tunAs AnD BillFishEs hAvE A sEriEs oF kEEls AnD FinlEt nEAr thE tAil.Although most oF thEir sCAlEs hAvE BEEn lost, tunAs AnD mACkErEls rEtAin A pAtCh oF CoArsE sCAlEs nEAr thE hEAD CAllED thE CorsElEt. thE kEEls, FinlEt, AnD CorsElEt hElp DirECt thE Flow oF wAtEr ovEr thE BoDy surFACE in suCh As wAy As to rEDuCE rEsistAnCE (sEE thE FigurE).AgAin, supErsoniC jEts hAvE similAr FEAturEs.
onE potEntiAl proBlEm is thAt opEning thE mouth to BrEAthE DEtrACts From thE strEAmlining oF thEsE FishEs AnD tEnDs to slow thEm Down. somE spECiEs oF tunA hAvE spECiAlizED groovEs in thEir tonguE. it is thought thAt thEsE groovEs hElp to ChAnnEl wAtEr through thE mouth AnD out thE gilt slits, thErEBy rEDuCing wAtEr rEsistAnCE.
thErE ArE ADAptAtions thAt inCrEAsE thE Amount oF ForwArD thrust As wEll As thosE thAt rEDuCE DrAg.AgAin, thEsE FishEs ArE thE Envy oF EnginEErs. thErE high, nArrow tAils with swEpt-BACk tips ArE Almost pErFECtly ADAptED to proviDE propulsion with thE lEAst possiBlE EFFort. pErhAps most importAnt oF All to thEsE AnD othEr FAst swimmErs is thEir ABility to sEnsE AnD mAkE usE oF swirls AnD EDDiEs (CirCulAr CurrEnts) in thE wAtEr. thEy CAn gliDE pAst EDDiEs thAt woulD slow thEm Down AnD thEn gAin ExtrA thrust By "pushing oFF" thE EDDiEs. sCiEntists AnD EnginEErs ArE BEginning to stuDy this ABility oF FishEs in thE hopE oF DEsigning morE EFFiCiEnt propulsion systEms For ships.
thE musClEs oF thEsE FishEs AnD thE mEChAnism thAt mAintAins A wArm BoDy
【单选题】 The Dinee, a Native American (people) of the southwestern United States, were (once) seminomadic hunters who (practiced) a (few) agriculture.
A．people
B．once
C．practiced
D．few
A．people
B．once
C．practiced
D．few
【单选题】 All (living) things are (made up of) one or more cells, and each of these cells (were) produced by an (already existing) cell.
A．living
B．made up of
C．were
D．already existing
A．living
B．made up of
C．were
D．already existing
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