音频来源：TPO 35 听力 L2
Professor:One of the frustrating things about archaeology, especially for beginning students, is that theories are constantly evolving. A theory that's been accepted for many years may suddenly be called into question.
Student:But why would that happen?
Professor:There are probably a number of reasons. Earlier finds are always being reexamined in the context of new finds. Or it may just be that someone looks at the evidence in a different way, has a different idea of what it suggests.
Take the theory about the earliest permanent settlements. They were found in an area to the east of the Mediterranean Sea called the Levant. And the people who lived there were the Natufians.
For quite some time, it's been widely accepted that about 15,000 years ago, the Natufians developed a sedentary lifestyle. Can someone remind us what that means?
在相当长的一段时间里，人们一直以为大约 15000 年之前，纳图夫人就形成了定居的生活方式。谁能告诉我们这意味着什么？
Student:It means that they stopped being nomadic, that they began staying in one area year round instead of moving around all the time.
Professor:Right. And we think there was an abundance of edible plants and animals in the area at that time that make this shift away from a nomadic lifestyle possible. Uh...keep in mind that the Natufians were hunter-gatherers. So in spite of other changes, they were always a pre- agricultural society.
1.What is the lecture mainly about?
A. Techniques used by the Natufians for building shelters.
B. Different interpretations of archaeological evidence from Natufian sites.
C. Strategies used by different hunter-gatherer societies in response to climate change.
D. The development of the Natufians into an agricultural society.
"One of the frustrating things about archaeology, especially for beginning students, is that theories are constantly evolving. A theory that has been accepted for many years may suddenly be called into question." 文章开头有明显的主旨句，并且下文中用具体的例子 "Natufian 部落是否驻扎"来具体证明这个观点，故选项 B 正确。 A 选项说 "Natufian 盖庇护所的技术"，未提及，故排除。 C 选项说"不同的 hunter-gatherer 群体应对气候的策略"，未提及，故排除。 D 选项说 "Natufian 发展为农业社会的过程"，未提及，故排除。