英语听力：自然百科 考古揭秘佛罗里达州

 The cool waters of Wakulla Springs makes it a popular place to beat Florida's heat. Tourists lounge on the May beach, while the locals prefer the opposite bank. Despite the cold-blooded company, people have visited these historic springs for years. But for how long is a mystery archeologists hope to solve.

National Geographic¹ Grantee Jim Dunbar and his research team are searching for signs of the first Floridians, Ice Age people who may have come to Wakulla for a spring break over 10,000 years ago. 

Your teeth could project yourself back into a time. You would see a Florida that would look like that a Serengeti in terms of the animal population it had. And where would animals go like that? They would come around, maybe oasis² where there was plentiful³ water resources and with, say, large herbivores that come in，what else would come in? The predators⁴. It could be a sabre-teeth cat. It could be something like that, or it could be people. 

The crew is hoping to hit Pader, prehistoric⁵ tools left behind by an Ice Age hunter. In the search for Stone Age tools, digging is done, the old fashioned way. Each bucketful gets carefully screened for the smallest clues. And the sand itself is helping⁶ geologists⁸ unlock the age of their discoveries. Quartz⁹ crystals in the sand naturally emit a radioactive signal that gets reset¹⁰ when exposed to light. By testing the signal, geologist⁷ Jack¹¹ Rink can tell how long ago this sand layer was buried. Jack takes a core sample to study in his lab, and gets a reading on radiation levels.

“In a couple of months, we'll know how long it's been since this sand was last exposed to light. And by relating that information, we can say that the artifact was deposited at the same time as when the sand was exposed to light. And that gives us a date on the artifact itself.”

Part way through the dig, the archeologists have found hundreds of small artifacts, mostly small flakes¹² from stone hunting tools.

A short distance away, clues begin to surface as to what was on the prehistoric dinner table. A dive team led by underwater archeologists Andy Helmins sets out to investigate fossilized mastodon bones at the bottom of the springs. It's forensic¹³ science at 25 feet deep.

While routine takes notes, Andy makes a fascinating find, deep grooves¹⁴ on a mastodon fossil. It could be the work of an Ice Age hunter. While the divers¹⁵ explore underwater, geologists Tom Scott and Hurling¹⁶ Linz are heading out on a different expedition.

This one is underground with the help of special ground penetrating¹⁷ radar¹⁸. They may look like Ghost Busters, but this gear really works. The radar reveals dense¹⁹ objects such as fossils buried below.

“So, you know, conceivably, we have the ground truth of this to see if this were a bone or some archeological material, but anyone of those little reflections done in the thermal²⁰ camera are certain could be.”

Back at the dig site, Jim's team strikes gold.

“Below in the holes, right in this location, we found a tool that we believe, I would call it a benchmark.”

A well-preserved knife. Jim guesses that this point could be 14,000 years old, more than 1,500 years before people were thought to have arrived in Florida. It will take months for test results to reveal whether the tool belonged to one of the first Floridians. In the mean time, Jim and his team will just have to wait. Fortunately for them, Wakulla Springs isn't such a bad place to pass the time.

Sponsored by National Geographic Mission Programs, taking science and exploration into the new millennium²¹.

1 geographic   

adj.地理学的，地理的

参考例句：

• The city's success owes much to its geographic position. 这座城市的成功很大程度上归功于它的地理位置。 来自《简明英汉词典》
• Environmental problems pay no heed to these geographic lines. 环境问题并不理会这些地理界限。 来自英汉非文学 - 环境法 - 环境法

2 oasis   

n.（沙漠中的）绿洲，宜人的地方

参考例句：

• They stopped for the night at an oasis.他们在沙漠中的绿洲停下来过夜。
• The town was an oasis of prosperity in a desert of poverty.该镇是贫穷荒漠中的一块繁荣的“绿洲”。

3 plentiful   

adj.富裕的，丰富的

参考例句：

• Their family has a plentiful harvest this year.他们家今年又丰收了。
• Rainfall is plentiful in the area.这个地区雨量充足。

4 predators   

n.食肉动物( predator的名词复数 )；奴役他人者（尤指在财务或性关系方面）

参考例句：

• birds and their earthbound predators 鸟和地面上捕食它们的动物
• The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》

5 prehistoric   

adj.（有记载的）历史以前的，史前的，古老的

参考例句：

• They have found prehistoric remains.他们发现了史前遗迹。
• It was rather like an exhibition of prehistoric electronic equipment.这儿倒像是在展览古老的电子设备。

6 helping   

n.食物的一份&adj.帮助人的，辅助的

参考例句：

• The poor children regularly pony up for a second helping of my hamburger. 那些可怜的孩子们总是要求我把我的汉堡包再给他们一份。
• By doing this, they may at times be helping to restore competition. 这样一来, 他在某些时候,有助于竞争的加强。

7 geologist   

n.地质学家

参考例句：

• The geologist found many uncovered fossils in the valley.在那山谷里，地质学家发现了许多裸露的化石。
• He was a geologist,rated by his cronies as the best in the business.他是一位地质学家，被他的老朋友们看做是这门行当中最好的一位。

8 geologists   

地质学家，地质学者( geologist的名词复数 )

参考例句：

• Geologists uncovered the hidden riches. 地质学家发现了地下的宝藏。
• Geologists study the structure of the rocks. 地质学家研究岩石结构。

9 quartz   

n.石英

参考例句：

• There is a great deal quartz in those mountains.那些山里蕴藏着大量石英。
• The quartz watch keeps good time.石英表走时准。

10 reset   

v.重新安排，复位；n.重新放置；重放之物

参考例句：

• As soon as you arrive at your destination,step out of the aircraft and reset your wristwatch.你一到达目的地，就走出飞机并重新设置手表时间。
• He is recovering from an operation to reset his arm.他做了一个手臂复位手术，正在恢复。

11 jack   

n.插座，千斤顶，男人；v.抬起，提醒，扛举；n.（Jake）杰克

参考例句：

• I am looking for the headphone jack.我正在找寻头戴式耳机插孔。
• He lifted the car with a jack to change the flat tyre.他用千斤顶把车顶起来换下瘪轮胎。

12 flakes   

小薄片( flake的名词复数 )； （尤指）碎片； 雪花； 古怪的人

参考例句：

• It's snowing in great flakes. 天下着鹅毛大雪。
• It is snowing in great flakes. 正值大雪纷飞。

13 forensic   

adj.法庭的，雄辩的

参考例句：

• The report included his interpretation of the forensic evidence.该报告包括他对法庭证据的诠释。
• The judge concluded the proceeding on 10:30 Am after one hour of forensic debate.经过近一个小时的法庭辩论后，法官于10时30分宣布休庭。

14 grooves   

n.沟( groove的名词复数 )；槽；老一套；（某种）音乐节奏v.沟( groove的第三人称单数 )；槽；老一套；（某种）音乐节奏

参考例句：

• Wheels leave grooves in a dirt road. 车轮在泥路上留下了凹痕。 来自《简明英汉词典》
• Sliding doors move in grooves. 滑动门在槽沟中移动。 来自《现代汉英综合大词典》

15 divers   

adj.不同的；种种的

参考例句：

• He chose divers of them,who were asked to accompany him.他选择他们当中的几个人，要他们和他作伴。
• Two divers work together while a standby diver remains on the surface.两名潜水员协同工作，同时有一名候补潜水员留在水面上。

16 hurling   

n.爱尔兰式曲棍球v.猛投，用力掷( hurl的现在分词 )；大声叫骂

参考例句：

• The boat rocked wildly, hurling him into the water. 这艘船剧烈地晃动，把他甩到水中。 来自《简明英汉词典》
• Fancy hurling away a good chance like that, the silly girl! 想想她竟然把这样一个好机会白白丢掉了，真是个傻姑娘！ 来自《简明英汉词典》

17 penetrating   

adj.（声音）响亮的，尖锐的adj.（气味）刺激的adj.（思想）敏锐的，有洞察力的

参考例句：

• He had an extraordinarily penetrating gaze. 他的目光有股异乎寻常的洞察力。
• He examined the man with a penetrating gaze. 他以锐利的目光仔细观察了那个人。

18 radar   

n.雷达，无线电探测器

参考例句：

• They are following the flight of an aircraft by radar.他们正在用雷达追踪一架飞机的飞行。
• Enemy ships were detected on the radar.敌舰的影像已显现在雷达上。

19 dense   

a.密集的，稠密的，浓密的；密度大的

参考例句：

• The general ambushed his troops in the dense woods. 将军把部队埋伏在浓密的树林里。
• The path was completely covered by the dense foliage. 小路被树叶厚厚地盖了一层。

20 thermal   

adj.热的，由热造成的；保暖的

参考例句：

• They will build another thermal power station.他们要另外建一座热能发电站。
• Volcanic activity has created thermal springs and boiling mud pools.火山活动产生了温泉和沸腾的泥浆池。

21 millennium   

n.一千年，千禧年；太平盛世

参考例句：

• The whole world was counting down to the new millennium.全世界都在倒计时迎接新千年的到来。
• We waited as the clock ticked away the last few seconds of the old millennium.我们静候着时钟滴答走过千年的最后几秒钟。