Which of the following is NOT true about linguistic dictionaries

Which of the following is NOT true about linguistic dictionaries?（ ）
A、They aim at defining words and explaining their usages in the language.
B、They usually cover such areas as spelling, pronunciation, meaning, grammatical function, usage and etymology, etc.
C、They can be monolingual and bilingual.
D、They provide encyclopedic information concerning each headword.
【正确答案】：D
【题目解析】：语言学词典只考虑语言现象本身，而不会涉及词条相关的百科知识。D选项表述不是语言学词典，而是专业词典。