Complete the following statements with proper words or expressions according to the course book.The stylistic features of idioms are ( ), slang and literary expressions.
【正确答案】：COLLOQUIALISMS
【题目解析】：本题考查习语的文体色彩。习语的文体色彩包括：口语词 (Colloquialisms)、俚语 (Slang)和书面表达式 (Literary expressions)。
