单项选择题

Questions 17-20 are based on the following monologue introducing the "Clovis first" theory. You now have 20 seconds to read Questions 17-20.
Which of the following words can best describe the author’s attitude in writing the article

A．Informative.
B．Optimistic.
C．Convincing.
D．Enthusiastic.

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单项选择题

单项选择题

Questions 17-20 are based on the following monologue introducing the "Clovis first" theory. You now have 20 seconds to read Questions 17-20. Which of the following words can best describe the author’s attitude in writing the article 您的浏览器不支持 audio 元素。