研究生用听说教程-unit15...
研究生用听说教程-unit14...
研究生用听说教程-unit13...
Onesuchnovelideais thatofinsertingintothechromosomes (25)ofplantsdiscretegenesthatarenot apartoftheplants’naturalconstitution: specifically,theideaofinsertinginto nonleguminousplantsthegenes,ifthey c...
Butachieving necessarymatchesinphysicalproperties acrossinterfacesbetweenlivingand nonlivingmatterrequiresknowledgeof (20)whichmoleculescontrolthebondingof cellstoeachother—anareathatwe havenotyetexp...
Onlywhenasystempossessesnatural orartificialboundariesthatassociate thewaterwithinitwiththehydrologic cyclemaytheentiresystemproperlybe (30)termedhydrogeologic. 只有当某一地质系统拥有自然的...
BlackFictionsurveysawidevarietyof novels,bringingtoourattentioninthe processsomefascinatingand (75)little-knownworkslikeJamesWeldon Johnson’sAutobiographyofanEx- ColoredMan. 《黑人小说》考察了...
Thus,for instance,itmaycomeasashockto mathematicianstolearnthatthe Schrodingerequationforthehydrogen (30)atomisnotaliterallycorrect descriptionofthisatom,butonly anapproximationtoasomewhatmore correcte...
Thispreferenceforexogamy, Gutmansuggests,mayhavederivedfrom WestAfricanrulesgoverningmarriage, which,thoughtheydifferedfromone tribalgrouptoanother,allinvolved (60)somekindofprohibitionagainstunions wi...
Thatsexratiowillbe favoredwhichmaximizesthenumberof descendantsanindividualwillhaveand hencethenumberofgenecopies transmitted. 那种性别比例能在最大程度上增加一个个体所能拥有的后代...