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Questions 17-20 are based on the following monologue introducing the "Clovis first" theory. You now have 20 seconds to read Questions 17-20.
According to the "Clovis first" theory, when did people travel to North America

A．30,000years ago.
B．13,000 years ago.
C．14,000 years ago.
D．20,000 years ago.

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Questions 17-20 are based on the following monologue introducing the "Clovis first" theory. You now have 20 seconds to read Questions 17-20. According to the "Clovis first" theory, when did people travel to North America 您的浏览器不支持 audio 元素。