题目内容：
根据以下材料，回答题TheHumanGenomeProject,agreat$3billion,15-yeartaskaimedatdrawingthegeneticmapofhumans,isnowmorethan90percentcompleted.Thescientificandmedicalcommunitiesareveryexcitedaboutthechancesgeneticresearch
providesforgettingridofdiseasesandprolonginghumanlife.Butthosecommunitiesandpolicymakersarealsocarefulaboutthescientificdoortheyareopeningastheprojectuncoversthe
mysteriesoflife.
Forthelastfewyears,thegeneticadvancesinthefastdevelopingfieldofbiotechnologyhaveprovidedmaterialforallkindsofwork,butthedevelopmentsofmodernscienceinunlockingthe
secretsofhumangeneticcodehaveopenedaworldofpossibilitiesforhumanhealth,aswellasforthepopulationimagination.
WhileEuropeanandJapaneseresearchersaremakingrapidprogressindecodinghumanDNA,theleadingorganizationforgeneticresearchintheUntiedStates,whichbeganin1990,is
"unlockingthecode"ofthehumanbodytolearnhowtodefeatfataldiseases.Already,theHumanGenomeProjecthasbecomewidelyknownandpraisedforfindingthegenesconnectedwithas
yetterriblediseases,andmakingprogresstowardseparatingthegenesthatshowasignofbreastcancerorAIDS.
Oncethesegenesarefoundandstudied,researcherscandevelopnewwaystoattackinfections,andgeneticdiseases.Medicalcompaniesareveryinterestedinmappingthehumangenome；as
theyexpecttodevelopalotofnewdrugsfortheseillnesses.
Whydidthescientistsworksohardatmappingthehumangenome? A．Becausethehumangenomecandestroymanyillnesses.
B．Becausethehumangenome'scompletioncanhelptogetridofmanydiseases.
C．Becausetheywantedtobebetterknownthanothers.
D．BecausetheHumanGenomeProjectcanprovidedalotofchancesofwork.
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