单项选择题

Language is a tool of communication. The symbol "Highway Closed" on a highway serves（）。

A. an expressive function
B. an informative function
C. a performative function
D. a persuasive function

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单项选择题
The word Motel comes from motor + hotel . This is an example of （） in morphology.

A. backformation
B. conversion
C. blending
D. acronym
单项选择题
Owen wouldn't eat anything （） he cooked it himself.

A. until
B. since
C. unless
D. while
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