【正确答案】 C

【答案解析】[听力原文]
22New research on one of the oldest and most complete American skeletons reveals further proof that all Native Americans descended from Siberian migrants who crossed a land bridge to North America thousands of years ago, a team of scientists announced Thursday.
The bones of a teenage girl discovered in an underwater Mexican cave date back to at least 12,000 years ago. 23The smoking gun is her mitochondrial DNA, which indicate an Asian lineage—that she shares with many modem descendants of native North and South Americans.
The girl's age fits the currently favored model of American migration from Asia across the Bering Strait, which was once a land bridge. The model suggests a population known as the Clovis people spread throughout the continent around 13,000 years ago.
24Just 15 or 16 years old, the girl apparently slipped and fell into the pit when it was a dry basin. She shattered her pubic bone and died there.
With her remains so well-preserved, scientists could see that she fit the physical profile of a paleoamerican, 25who tend to have narrower skulls and shorter faces. When the genetic evidence revealed her Asian heritage, the scientists proved that modem indigenous North and South Americans and paleoamericans all came from the same place. Facial differences between modem Native Americans and paleoamericans could be explained by evolution.
But it doesn't explain the strange findings in South America. Perhaps those are the archeological remains of some prehistoric version of the Roanoke settlers—a group of people who arrived by ship and didn't survive.

Where does native Americans descend from based on the research of the skeletons?

[解析] 细节理解题。短文开头部分就讲到通过对这个完整且古老的skeletons的研究表明。美国人的祖先应该是来自西伯利亚的移民。故选C。