Since 2004, some 60 million visitors to the U.S. have had their two index finger

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问题 Since 2004, some 60 million visitors to the U.S. have had their two index fingerprints recorded by an ______ scanner.

选项 A、opposite
B、organic
C、occasional
D、optical

答案 D

解析 opposite：对面的，在……对面，反义词，相反的东西；organic：有机的；occasional：偶尔的；optical：光学的

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