单项选择题

Stoker's argument is based on his belief that______.

A．language is a product of the brain
B．language is a system of meaningful codes
C．sign language is derived from natural language
D．sign language is as efficient as any other language

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单项选择题

Most educators objected to Stoker's idea because they thought______.

A．a language should be easy to use and understand
B．sign language was too artificial to be widely accepted
C．a language could only exist in the form of speech sounds
D．sign language was not extensively used even by deaf people

单项选择题

Blacksmiths, silversmiths, and candle makers are mentioned as examples of artisans who______.

A．maintained their businesses at home
B．were eventually able to use sophisticated technology
C．produced unusual goods and commodities
D．would employ only family members