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