Over the years the European Union has made great efforts to ______ the safety of food and protect the health of its people.A.discoverB.ensureC.reviseD.react
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B解析动词辨析题。A. discover 发现 B. ensure 确保 C. revise 修订 D. react 反应 句意：多年来欧盟已经尽力确保食品安全保护人民健康。根据语境选B