The author mentions the professions of Dr. Appleton and Dr. Meeker mainly because he wants to _ _.(本题2.5分)
A、 help readers know more about them
B、 show that doctors can write great books, too
C、 make his arguments sound more convincing √
D、 show readers they have different professions
出自：西安石油大学大学英语I（下）
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