单项选择题

What is the profession of the speaker

A．A teller.
B．An economist.
C．A travel agent.
D．A customs official.
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Which of the following does NOT help to separate the useful U-235 and nearly useless U~2387
A．The principle of gaseous diffusion.
B．A process involving magnetic separation of the two isotopes.
C．A process nearly identical in the chemical makeup.
D．A gas centrifug
单项选择题
Which of the following statements is true according to this passage
A．Facial recognition systems may possibly make false matches.
B．T.F. Green International Airport has installed the cameras in 2002.
C．Many other airports are now considering installing the cameras.
D．This technological invention is too expensive to install now.
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