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。