D
thE iDEA oF "Evolution" is vEry ClEArly shown in thE story oF horsE. millions oF yEArs Ago, thE horsE CAllEDEohippus with smAll tEEth AnD Four toEs livED in thE grounD whErE thE plAnts wErE EAsy to ChEw.BECAusE oF ChAnging ClimAtE AnD plAnts, horsEs with lArgEr tEEth, thrEE toEs, till onE toE AppEArED、FinAllyEohippus DiED out AnD thE onE-toED survivED so wEll ovEr thE grAsslAnDs By thE timE thE First mAn AppEArED on EArth.DArwin ConsiDErED All moDEm AnimAls hAD grADuAlly DEvElopED AnD so hAD mAn. thE EArliEst mEn, with sloping ForEhEADs AnD muCh smAllEr BrAins, likEEohippus sEEm to hAvE DiED out—thE wEAk onEs DiED out AnD thE wEll- EquippED onEs survivED、Also, likE thE AnimAls on thE DiFFErEnt gAlApAgos islAnDs, mEn DEvElopED DiFFErEntly ACCorDing to thE ConDition in whiCh thEy livED、pEoplE living in vEry hot CountriEs DEvElopED BlACk skins, whiCh ArE gooD protECtion AgAinst thE sun’s rAys, AnD pEoplE likE thE mongols AnDEskimos living in vEry ColD ClimAtEs hAvE FlAttEr FACEs AnD rounDEr BoDiEs thAn pEoplE ElsE whErE, to protECt thEm From thE ColD、
thE worD "Evolution" in thE pAssAgE mEAns ______.
A、grADuAl DEvElopmEnt
B、All living things DEvElopED From A FEw simplE Forms oF liFE
C、giving oFF
D、movEmEnt oF ships or solDiErs, plAnnED BEForE hAnD