单项选择题

Questions 17—20 are based on the following passage. You now have 20 seconds to read Questions 17—20.
Which of the following is a label warning

A．No smoking．
B．Liquid spray．
C．For external use only．
D．Contents under pressur

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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. Which of the following is a label warning 您的浏览器不支持 audio 元素。