单项选择题
Questions 11 to 18 are based on the conversation you have just heard.
A.A painter. B.A porter. C.A mechanic. D.A carpenter.
A.Reading its ads in the newspapers. B.Contacting its manager. C.Calling its personnel department. D.Searching its website.
A.People differ greatly in their ability to communicate. B.Most public languages are inherently vague. C.There are numerous languages in existence. D.Big gaps exist between private and public languages.