Arbitrariness of language makes it potentially creative, and conventionality of language makes a language be passed from generation to generation. As a foreign language learner, the latter is more important for us.
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By diachronic study we mean to study the changes and development of language.
A. 对
B. 错
Language change is universal, ongoing and arbitrary.
A. 对
B. 错
Language is a system of arbitrary, written signs which permit all the people in a given culture, or other people who have learned the system of that culture, to communicate or interact.
A. 对
B. 错
Applied linguistics is the application of linguistic principles and theories to language teaching and learning.
A. 对
B. 错