单项选择题

Questions 14 - 17 are based on the following passage about "Artificial Languages". You now have 20 seconds to read the questions 14 - 17. What are the advantages of artificial languages

A．They are simple.
B．They have no irregular grammatical forms.
C．They have no native speakers.
D．Both A anti B are right.

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单项选择题

单项选择题

Questions 14 - 17 are based on the following passage about "Artificial Languages". You now have 20 seconds to read the questions 14 - 17. What are the advantages of artificial languages 您的浏览器不支持 audio 元素。