单选题
Since 2004, some 60 million visitors to the U.S. have had their two index fingerprints recorded by an ______ scanner.
A. opposite B. organic C. occasional D. optical
A
B
C
D
【正确答案】
D
【答案解析】
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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