托福模拟试题听力 - TPO23 - 讲座1

时间 : 2013-10-22 08:22来源 : VOA官网 收听下载次数 :
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TPO23 Lecture l- Archaeology (Antikythera (Mechanism)

Professor:I was talking to one of my colleagues in the physics department the other day, and we ended up discussing how one discovery can change everything. My colleague mentioned how the theory of relativity completely changed the field of physics. At any rates, that conversation got me thinking about archaeological finds that really changed our understanding of ancient civilizations. So I want to talk about the discovery of the Antikythera Mechanism. The Antikythera Mechanism was found a hundred years ago, under water in an ancient Greek shipwreck in the Mediterranean Sea. It was in extremely poor condition and in many corroded pieces. But once we figured out what it was and reconstructed it. Well, I simply don't have the words to convey how extraordinary this find was.The Antikythera Mechanism is a relatively small device, roughly the size of a shoebox, made of gears fitted inside a wooden case. In its original state, there were rotating dials and other indicators on the top, with letters and drawings showing the Sun, the phases of the moon and different constellations. Inside the box, bronze gears would have rotated the displays. The displays, uh, the indicators of the Antikythera Mechanism, would then moved to show the motion of the Sun and moon relative to the planets and stars. The device could be used to tell the different phases of the moon and much more.

Well, scientists have recently analyzed the inscriptions on the mechanism and re-examine the other cargo in the ship wreck, and the evidence makes an absolute case that this device dates back to ancient Greece somewhere between 150 and 100 B.C.E. What makes that so fascinating is that before we found the Antikythera Mechanism, the earliest device we had that could track the Sun and moon like this was invented over 1,000 years later. So when this was first found, people literally would not believe it. Some of my colleagues insisted it had to have been made well after 100 B.C.E. But this physical evidence was conclusive. It was that old. Of course part of what made this find so unusual is that the Antikythera Mechanism is constructed of bronze. Now, it is not that bronze was all that rare in Greece then, it is just that bronze was valuable and could easily be recycled. It would have been relatively easy for a person with knowledge of metals to melt down bronze objects and forge them into ? well, say, coins. Bronze was used to made money back then. Or mold the bronze into anything else of value for that matter.We are very fortunate that the device ended up under water, because otherwise it probably would have ended up recycled into ? who knows what. Now, it was a challenge to figure out the Antikythera Mechanism. It spent over 2,000 years at the bottom of the sea before it was discovered. And even after it was discovered, it was still a number of years before we really understood what it was. You see, the mechanism had corroded underwater, and many of the gears were stuck together in a mass. Cleaning it was only partly successful. We could only get a good look at the structure of the gears after gamma-rays were used to see inside, very similar to the way X-rays are used to see your bones.Now, once we got a good look inside, we saw a really complex device. The many gears not only moved in a way that could indicate the phases of the moon. The Antikythera Mechanism also tracked both the lunar year and the solar year. Additionally, the gears also moved to match the motions of the planet and predicted eclipses. But one thing that is particularly notable is that the mechanism was so precise that it even took into account a particular irregularity in the moon's orbit, which requires some very complex math to replicate in mechanical device.You could say that the Antikythera Mechanism was a very precise calendar, which stands to reasons calendars were very important to ancient peoples. Religious festivals had to be held at the right time of year, crops needed to be planted at the right time as well. And let's not forget that eclipses in planetary motions had important symbolic meanings.

 

1 What is the lecture mainly about?

A. The methods archaeologists used to reconstruct the Antikythera Mechanism

B. The influence the Antikythera Mechanism has had on the study of physics

C. A research project in the combined fields of archaeology, physics, and mathematics

D. An archaeological discovery that challenged an accepted historical view



2 According to the professor, how did the Antikythera Mechanism work?

A. Dials on the device could be turned to calculate a ship's location at sea

B. The device was used to operate a larger computing system

C. A system of gears rotated the images located on the case

D. Light from the Sun illuminated particular indicators on the case throughout the day
 


3  What is the professor’s attitude about the proposition that the Antikythera Mechanism is over two thousand years old?

A. She is confident that the dating is accurate.

B. She is sure the dating will be revised in the future.

C. She is surprised that the dating remains inconclusive.

D. She believes that additional testing will be needed to confirm the dating

 

4 According to the professor, why is it unusual to discover a bronze artifact from ancient Greece?

A. Bronze objects were often recycled.

B. Bronze corrodes underwater very quickly

C. Ancient Greeks had limited access to bronze

D. Artists of ancient Greece preferred to work with other materials



5 How were archaeologists able to determine how the Antikythera Mechanism operated?

A. By comparing it to similar devices used 1,000 years later

B. By using gamma rays to see inside of the mechanism

C. By referring to ancient Greek writings about the mechanism

D. By consulting with colleagues in the field of physics

 

6 What does the professor imply about the ancient Greeks when she says this [But one thing that is particularly notable is that the mechanism was so precise that it even took into account a particular irregularity in the moon's orbit, which requires some very complex math to replicate in mechanical device.

A. They were the first to observe the irregularly in the Moon’s orbit.

B. They might not have been the inventors of the Antikythera Mechanism

C. They were more scientifically advanced than is commonly thought.

D. They appeared to have made some errors in their calculations.