【正确答案】
C
【答案解析】[听力原文]32-35
In ancient times, many people believed tile earth was a flat disc. Well over 2,000 years ago, rite ancient Greek philosophers were able to put forward two good arguments proving that it was not. Direct observations of heavenly bodies was the basis of both these arguments. First, the Greeks knew that during eclipses of the moon, file earth was between the sun and the moon, and they saw that during these eclipses, the earth's shadow on the moon was always round, they realized that this could be true only if the earth was spherical. If tile earth were a flat disc, then its shadow during eclipses would not be a perfect circle, it would be stretched out into a long ellipse. Tile second argument was based on what the Greeks saw during their travels. They noticed that the North Star, or Polaris, appeared lower in the sky when they traveled south, in more northern regions, the North Star appeared to them to be much higher in file sky. By the way, it was also from this difference in the apparent position of the North Star that the Greeks first calculated the approximate distance around the circumference of the earth, a figure recorded in ancient documents says 400,000 stadia, that's the plural of the word stadium. Today, it's not known exactly what length one stadium represents, but let's say, it was about 200 meters, the length of many athletic stadiums. This would hake the Greek' s estimate about twice the figure accepted today, a very good estimate for those writing so long before even the first telescope was invented.
32. What is the talk mainly about?
主旨题。关键处是：put forward two good arguments proving that it (the．earth)was not(a flat disc) ，随后又列出First…The second来支撑这个论点．
【正确答案】
A
【答案解析】[听力原文]
What does the professor say about ancient Greeks who traveled south?
综合理解题。关键点：They noticed that the Noah Star...appeared lower in the sky when they traveled south， in more northern regions，the North Star appeared to them to be much higher in the sky．进而又说：this difference in the apparent position of the North Star。B，C内容不完整，D与文章观点相悖。
【正确答案】
C
【答案解析】[听力原文]
What does the professor say the term stadium refers to?
细节推理题。从a figure recorded in ancient documents says 400,000 stadia，that's the plural of the word stadium这里可以看出stadium与stadia的关系。后面一句it's not known exactly what length one stadium represents， but let's say，“was about 200 meters，the length of many athletic stadiums可以看出，这是一个长度测量单位。