古文经主要是汉初由老儒生口耳相传的经典，直接用汉代通行的隶书记录下来的经典。()
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The most probable subject of the text would be______.
A. the middle class is easily subjected to depression
B. the young and the old should pay more attention to depression
C. our online behavior. is an indicator of our depression
D. at the advocacy of the author, we should be optimistic about everything
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