单项选择题

From the passage, we can infer that the author regards high-tech passports as______.

A．unnecessary
B．useless
C．unreadable
D．unreliable
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单项选择题
The main topic of this passage is ______.
A．the development of passports in America
B．the difference between RFID cards and passports
C．a passport with a tiny computer inside
D．the limitations of high-tech passports
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