题目内容

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

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签证分为外交签证、礼遇签证、公务签证、普通签证等。()

正常票价的有效期为一年。()

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。()

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