This passage is （）

单项选择题The ending of the passage is（）

A. serious
B. mysterious
C. curious
D. humorous

单项选择题Which is the best title of this passage（）

A. The Earliest People in North America.
B. The Earliest Immigrants to North America.
C. The People of the United States.
D. Europeans Were the Earliest People Coming to the North America.