单项选择题

Questions 14-16 are based on the following passage. You now have 15 seconds to read questions 14-16.
According to the talk, what do words mean

A．They are visual letters.
B．They are represented by sounds.
C．They are sounds represented by letters.
D．They are signs called letters.

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Number of people speaking English as their 1 st language is ______ .

单项选择题

Questions 14-16 are based on the following passage. You now have 15 seconds to read questions 14-16. According to the talk, what do words mean 您的浏览器不支持 audio 元素。