The study of how speech sounds are produced, transmitted, and perceived is called
A. phonetics
B. phonology
C. syntax
D. pragmatics
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The fact that we can always write new sentences to express our new ideas is a good illustration of the______feature of language.
A. duality
B. displacement
C. arbitrariness
D. productivity
签证分为外交签证、礼遇签证、公务签证、普通签证等。()
旅客兑换外币后,旅游者应妥善保管银行出具的外汇兑换证明(俗称“账单”),该证明有效期为5个月。()