TOEFL Listening: TPO-TOEFL听力TPO - 33EIVCMS9O5217IJR$

What additional information does the professor suggest that the student include in his paper? A. A comparison of traditional and modern farming technologies. B. Charges in the designs of chinampas over time. C. Differences in how various historians have described chinampas. D. Reasons why chinampas are often overlooked in history books.