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    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
    B
    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
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