Cloninghasalwaysbeenwithusandisheretostay.Itisanexact
问题详情：Cloninghasalwaysbeenwithusandisheretostay.Itisanexact____61_____（复制，拷贝）ofanotheranimalorplant.Itisadifficulttask____62____（undertake）.Cloningplantsisstraightforward_____63_____（而）cloninganimalsi...