单项选择题

Conversation 1

A. Classes for weekdays.
B. An interview.
C. Evening classes.
D. Academic tasks.
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单项选择题
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
单项选择题
One of the reasons why men invented certain sounds to express thoughts and actions was that they could______.
A. agree to certain signs
B. write down their feelings
C. make themselves understood each other
D. combine letters into words
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