单选题 In some California housing estates, a key alone is insufficient to get someone in the door; his or her voiceprint must also be______. (中国科学院2013年10月试题)
【正确答案】 D
【答案解析】解析：A项“duplicate”意为“复制”；B项“perceive”意为“感知，感受”：C项“acquire”意为“取得，获得”；D项“verify”意为“证明、证实，核实、查清”，本句是说需要验证他们的声音，因此选择D项。