Some universities are very large and have several thousand students．Others are small and h

"Pangea"

Read a short passage and then listen to part of a lecture on the same topic.

Reading Time: 45 seconds

Pangea

Plate tectonics assumes that the Earth's rigid outer layer is comprised of a number of slabs called plates, which are constantly in motion, changing the position of land masses and seascapes relative to each other throughout history. The plates move slowly but continuously at about the rate of 2 inches every year. The movement of the plates themselves may be caused by the unequal distribution of heat and pressure below them. Very hot material deep within the mantle, that is, the layer of rock inside the Earth, moves upward while the cooler layer descends into the mantle, putting the outer crust of the continents in motion. Several large plates include an entire continent with its surrounding seafloor; however, the boundaries of the plates do not correspond precisely with the seven continents that we recognize today.

Now listen to part of a lecture in a geography class. The professor is talking about Pangea.

Question

Explain how plate tectonics relates to the theory of continental drift.

Preparation Time: 30 seconds

Recording Time: 60 seconds

Begin reading now.

Reading Time: 45 seconds

Functions of Family

A family can be defined as a set of people who are related by blood, marriage, or adoption, and who share the primary responsibility for reproduction and caring for members of society. Although it has many different forms, as a social institution, the family is present in all cultures. As a basic unit of sociology, what functions does the family perform. in it? According to William F. Ogburn, the family performs four very important functions in a society, namely, reproduction, protection, socialization, and supplying affection and companionship.

"Fax Machines"

Now listen to part of a lecture in a business class. The professor is discussing the way that a fax machine transmits and receives data.

Question

Using the main points and examples from the lecture, describe the three parts of a fax machine and then explain how the fax process works.

Preparation Time: 20 seconds

Recording Time: 60 seconds

th each statement below? For each sentence, click in the correct box.

he people of the United States. Name another world leader you think is important. Give specific reasons for your choice.

Read and think about the following statement:

The college years are the best time in a person's life.

Do you agree or disagree with this statement?

Give reasons to support your opinion.

Read a short passage and listen to part of a lecture on the same topic.

Reading Time: 45 seconds

Ballads

A ballad is a poem that tells a story and is sung to music. Usually the story is of unknown origin, and a number of versions may be found for one song, a characteristic that stems from the oral tradition. As the song is passed on from one singer to another, a word is added or changed, or a slight alteration is made in the tune. In short, ballads represent a living tradition that evolves as the song is performed and passed to the next musician. A collection of ballads has been preserved in written form. in the volume English and Scottish Popular Ballads by Francis James Child, and many ballads are still referred to by their "Child number."

Now listen to part of a lecture in a music appreciation class. The professor is talking about the ballad of "Barbara Allen."

Question

Define a ballad, and then explain why "Barbara Allen" can be classified as a ballad.

Preparation Time: 30 seconds

Recording Time: 60 seconds

mouflage, chemical weapons, or warning coloration. For each sentence, click in the correct box. This question is worth 2 points.

至2010年中国经济社会发展的主要任务，其中经济发展的主要目标是：在优化结构、提高效益和降低消耗的基础上，实现2010年人均国内生产总值比2000年翻一番；资源利用效率显著提高，2010年单位国内生产总值能源消耗比2005年降低20％左右。

为了实现这个目标，中国将坚持以人为本、全面协调可持续的科学发展观，推动经济建设、政治建设、文化建设、社会建设全面发展。在主要依靠自身力量发展的同时，中国坚持对外开放，广泛开展国际经济技术合作，与世界各国共同分享人类文明成果；尊重和照顾他国的利益，与各国共同解决合作中出现的分歧和问题，努力实现互利共赢和共同发展；信守国际义务和承诺，积极参与国际体系和国际事务，努力发挥建设性促进作用；在和平共处五项原则的基础上与各国平等相待，积极发展与各国的友好关系。

ether each of the following is one of the findings. Click in the correct box for each sentence.