1.A.generated B.evolved

　　C.born D.originated

　　2.A.valuable B.appropriate

　　C.convenient D.favorite

　　3.A.attainments B.feasibility

　　C.entertainments D.evolution

　　4.A.essential B.available

　　C.reliable D.responsible

　　5.A.confirm B.inform

　　C.claim D.convince

　　6.A.for B.from

　　C.of D.with

　　7.A.organizations B.organisms

　　C.humans D.children

　　8.A.potential B.performance

　　C.preference D.passion

　　9.A.as B.just as

　　C.like D.unlike

　　10.A.ideological B.biological

　　C.social D.psychological

　　11.A.reviews B.reference

　　C.reaction D.recommendation

　　12.A.In a word B.In a sense

　　C.Indeed D.In other words

　　13.A.various B.different

　　C.the higher D.the lower

　　14.A.revealed B.exposed

　　C.engaged D.involved

　　15.A.regulations B.formations

　　C.rules D.constitutions

　　16.A.Although B.Whether

　　C.Since D.When

　　17.A.distinguished B.different

　　C.protected D.isolated

　　18.A.exposition B.comparison

　　C.contrast D.interaction

　　19.A.acquisition B.appreciation

　　C.requirement D.alternative

　　20.A.As a result B.After all

　　C.In other words D.Above all