【判断题】The description of a language at some point of time in history is a diachronic study ,but the description of language as it changes though time is a synchronic
【单选题】The description of a language at some point of time in history is a study; the description of a language as it changes through time is a historical study.
【简答题】The description of a language at some point of the time in history is a _________ study ; the description of a language as it changes through time is a _________ study.