单项选择题

A. an expressive functionB. an informative functionC. a……

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

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

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A. hang up
B. break up
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A. rarely
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单项选择题I can't leave. She told me that I （） stay here until she comes back.

A. can
B. must
C. will
D. may