问题
单项选择题
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C．about to be out of date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
答案
参考答案：D
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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C．about to be out of date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
参考答案：D