What category of writing does the passage belong to？
A. Narration.
B. Description.
C. Exposition.
D. Argumentation.
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Which of the following statements about Coursera is CORRECT？
A. Coursera"s Stanford background makes it develop so quickly.
B. Coursera is the first online project that makes use of peer assessment.
Coursera has noticed that human feedback is crucial in online teaching.
D. Coursera courses are provided by top universities in the U. S. and U. K.
明清时期的宁波商帮，以经营钱庄、药堂、缝纫闻名于世。
京杭大运河浙江段全长128.5公里，是浙江省重要的水运航线。
In the first paragraph, the author introduces his topic by______.
A. explaining a phenomenon
B. justifying an assumption
C. posing a contrast
D. making a comparison
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