Which one could be the best title of the article? Dr. Horace Well’s discovery______.

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问题 Which one could be the best title of the article?
Dr. Horace Well’s discovery______.

选项 A、led to the introduction of fluoride.
B、was less important than Greene Vardiman Black’s foot engine.
C、left many patients laughing.
D、had a much wider impact than just on dentistry.

答案D

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