题目内容
land masses and blue- green oceans. We had never seen the Earth from that distance before. To us, it appeared
as though the Earth had always looked that way and always would. Scientists now know, however, that the
surface of the Earth is not as permanent as we had thought.
Scientists explain that the surface of our planet is always moving. Continents moves about the Earth like
huge ships at sea. They float on pieces of the Earth's outer skin. New outer skin is created as melted rock
pushed up from below the ocean floor. Old outer skin is destroyed as it rolls down into the hot area and melts
again.
Only since the 1960s have scientists really began to under- stand that the planet Earth is a great living
machine. Some experts have said this new understanding is one of the most important revolutions in scientific
thought. The revolution is based on the work of scientists who study the movement of the continents-a science
called plate tectonics.
The modern story of plate tectonics begins with the German scientist Alfred Wegener. Before World War
One, Wegener argued that the continents had moved and were still moving. He said the idea first occurred to
him when he observed that the coastlines of South America and Africa could fit together like two pieces of a
puzzle. He proposed that the two continents might have been one and then split apart.
Wegener was not the first person to wonder about the shape of the continents. About 500 years ago,
explorers thought about it when they made the first maps of Americas. The explorers noted the east coast of
North America and South America would fit almost exactly into the west coast of Europe and South Africa.
What the explorers did not do, but Wegener did, was to investigate the idea that the continents move.
B. Human's recognition of the earth's surface.
C. The German scientist Alfred Wegener.
D. The early explorers' discovery.
B. Our ancient thought that the surface of the earth is still.
C. Alfred Wegener was not the first person to investigate the idea that the continents move.
D. The coastlines of India and Africa fit together.
B. study of architecture
C. earth surface
D. structural geology
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| Advertising is a form of communication that uses all kinds of media, and is visible everywhere these days. Typical customers of advertising companies are other companies, or businessmen, who want to persuade potential customers to buy more of what they make or sell. But there are other kinds of customers. Some organizations spend large sums of money on advertising a political party or other group that sells what is not, strictly speaking, a product or service. Such non - profit organizations are not typical advertising customers, and they prefer ways of spreading knowledge, changing attitudes, and improving society. Many advertisements are designed to increase sales of products and services by either improving brand image or, in the case of non - profit organizations, expressing ideas. In order to achieve th~s, advertisements will often pass on truthful information while delivering their messages. Every major medium is a means of delivering these messages, including television, radio, cinema, magazines, newspapers, video games, the Internet and billboards (大幅广告牌). Advertising will usually be created and. placed by an advertising agency on behalf of company or other organization. Spending on advertising has increased greatly in recent years. In 2006, spending was estimated at $155 billion in the United States and $385 billion worldwide; the latter is expected to reach more than $500 billion by 2010. While advertising can be seen as a necessity for economic growth and social development, it is not without social costs. Advertisement emails and other forms of junk mail have become so popular that ~they have become a major burden to users of I nternet email services, as well as a financial burden on Internet email service providers.
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