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

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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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