______ is the smallest unit of sound which is significant in a language.

(单选题)41.（ ） (单选题)40.（ ） (单选题)39.（ ） (单选题)Which is the best title for the text? (单选题)What’s the meaning of the underlined “visual” in paragraph 4 (单选题)Jody Culham’s investigation shows that Canning ________. (单选题)According to the passage, which of the following statement i (单选题)It can be inferred from the last two paragraphs that _______ (单选题)According to the passage, all the following are more efficie (单选题)According to the passage, which of the following is TURE?