【单选题】

According to the author biometric technology is____.
A．in the stage of theoretical study

B．widely used in the world
C．about to be out of date
D．developing rapidly

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根据网考网移动考试中心的统计，该试题：

26%的考友选择了A选项

6%的考友选择了B选项

4%的考友选择了C选项

64%的考友选择了D选项

According to the author biometric technology is____.A．in the stage of theoretical study