4Rs包括（ ） A: 关联(Relativity) B: 反应(Reaction) C: 关系(Relation) D: 回报(Retribution)
4Rs包括（ ） A: 关联(Relativity) B: 反应(Reaction) C: 关系(Relation) D: 回报(Retribution)
That model won't go into ______ before late 2007. A: contribution B: retribution C: evolution D: production
That model won't go into ______ before late 2007. A: contribution B: retribution C: evolution D: production
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