单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20.
A potential problem which might be caused by the use of an artificial nose is ______ .

A．negligence of public safety
B．an abuse of personal freedom
C．a hazard to physical health
D．a threat to individual privacy

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单项选择题

单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. A potential problem which might be caused by the use of an artificial nose is ______ . 您的浏览器不支持 audio 元素。