单选题
The origin of language is ______.
A、
clearly explained in this passage
B、
a matter that can not be or has not been explained or understood
C、
a question that was difficult to answer
D、
a problem already solved
【正确答案】
B
【答案解析】
[解析] 细节推理题。文章开头就说文字是怎么发明的还是一个谜，即是没办法解释和理解的。
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