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.
Why are "Clovis people" believed to first enter North America

A．Some fossils have been discovered.
B．They were found to have lived in the area known as the refuge during the ice age.
C．Some spear points were discovered.
D．It is in accordance with the biblical explanation.

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单项选择题

What are the two things that the author of this article tries ’to compare

A．The attack on Pearl Harbor and the sinking of the Titanic.
B．Historical fiction movies and successful box office hits.
C．The movie Titanic and the on-show-movie Pearl Harbor.
D．Sinking boats and famous actors.

单项选择题

The period of adolescence is much longer in industrial societies because______.

A．the definition of maturity has changed
B．the industrialized society is more developed
C．more education is provided and laws against child labor are made
D．ceremonies for adolescence have lost their formal recognition and symbolic significance

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

Questions 17-20 are based on the following monologue introducing the "Clovis first" theory. You now have 20 seconds to read Questions 17-20.
Why are "Clovis people" believed to first enter North America