13.Which of the following is true according to the passage?
Passage Two
Scientists have discovered a lake in southwest Florida that is thousands of years old.
eries made there have led scientists to believe this is one of the most important areas for studies of ancient man,animals,and climate in North America.
At the bottom of the lake,they have found bones of now extinct animals that were killed and cooked for food by humans over 12,000 years ago.
A hunting device was discovered___one of the oldest ever found.
This great quantity of human remains and plant and animal fossils gives the scientists a rare chance to study combinations of climate,
and ecology that prepared the way for human survival in America.
The lake is at least 240 feet deep at one point.
It is rich in minerals and contains very little oxygen.
This has helped to preserve specimens in the lake that would usually have been destroyed.
Because several types of animals were found that are now extinct,it raises several questions among scientists..
Did these animals die of natural causes,or were they hunted into extinction by human beings?
Questions 14 to 16 are based on the passage you have just heard.
【大学英语四级考试听力预测试题(6)】相关文章:
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