By the second sentence of Paragraph 2, the author means to show that ______. A: pigs attack human beings more frequently than sharks B: people get hurt much more easily in a car accident C: people get killed more easily by pigs or car accident than by sharks D: sharks rarely kill human beings when they are not provoked to do so

Q19. Select a primary producer from the list A: Sharks B: Urchins C: Seagrass D: Worms E: Birds

How long does it take for the sharks to arrive and attack the marlin? A: Ten minutes. B: One hour. C: Six hours. D: A full day.

63. "When dealing with goal-relationship conflicts, ""sharks"" use strength to get what they want. They try to win by [ ]." A: giving up their goals B: giving in to other people C: overpowering other people D: stay away from other people

How does the old man know immediately the size of the great marlin he has caught? A: Soon after taking the bait, the fish jumps into the air, showing itself to the old man. B: Santiago has encountered this fish before as a younger man. C: He pulls and pulls on the line and nothing happens. D: He doesn’t know the size of the fish until after the sharks have attacked it.

Passage9<br/><spanstyle="display:block;text-align:center;">EvolutionoftheShark</span>Theshark,whateverelseitmightbe,isalmostuniquelysuccessful.Accordingtofossilevidence,theearliestshark-likecreaturesprowledtheworld’soceans450millionyearsago—longbeforetheageofdinosaurs.Comparedtothis,man’sspanofacoupleofmillionyearsisamereflashofatigershark’stail.<br/>Evolutionisthegrindinglyslowprocesswhichrewardssuccessby“survivalofthefittest”.Organismsbestsuitedtoexploittheirenvironmentsurvivetobreed,producingmorelikethemselves.Thoselesssuitedtotheirsurroundingsfailtoprosperandsimplydieout.Ifanenvironmentchanges,whichmaymeanchangesinpredators*orfoodsupply,aswellasphysicalsurroundings,aspeciesmayneedtoadaptifitistosurvive.<br/>Whathappensinpracticeisthatoneormoreofthemyriadtinydifferencesthatoccurnaturallyinapopulationbecomeanadvantageordisadvantage.Ifthecharacteristicisanasset,thecreaturepossessingitismorelikelytosurviveandpassitontothenextgeneration.Ifitisnot,theindividual,andthecharacteristic,aremorelikelytodieout.Humans,forinstance,althoughallpartofthesamespecies,comeinmanyshapesandsizes.Althoughmodemman’scapacitytochangehisenvironmenthasreducedhisneedtoadapttoit,someofthesecouldbecomemoreorlessadvantageousifoursurroundingsweretochange.<br/>Althoughtheshark’senvironment,thesea,hasprobablybeenmoreconstantthantheone-thirdoftheglobethatisland,sharks,too,haveundergoneinnumerablechangesoverthemillennia.AsNatureexperimentedtofindherperfectfish,thereweremanysuccessesbutprobablymanymoredeadends.Someofthesearepreservedinlayersofancientrock,the“fossilrecord”,fromwherepaleontologists**laterunearththem.<br/>*predator：捕食其他动物为生的动物<br/>**paleontologist：古动物学家<br/><spanstyle="display:block;text-align:right;">(2005年5月试题)</span>