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  3. Man is a land animal, but he is also closely tied to the sea. Throughout history the sea has served the needs of man. The sea ha

Man is a land animal, but he is also closely tied to the sea. Throughout history the sea has served the needs of man. The sea ha

admin2012-09-11  50
问题     Man is a land animal, but he is also closely tied to the sea. Throughout history the sea has served the needs of man. The sea has provided man with food and a convenient way to travel to many parts of the world. Today, experts believe that nearly two-thirds of the world’s population live within eighty kilometers of the seacoast.
    In the modern technological world the sea offers many resources to help mankind survive. Resources on land are beginning to grow less. The sea, however, still offers hope to supply many of man’s needs in the future.
    The riches of the sea yet to be developed by man’s technology are impressive. Oil and gas explorations have existed for nearly thirty years. Valuable amounts of minerals such as iron, copper and so on exist on the ocean floor.
    Besides oil and gas, the sea may offer new sources of energy. For example, warm temperature of the ocean can be used as the steam in a steamship. Sea may also offer a source of energy as electricity for mankind.
    Technology is enabling man to explore even deeper under the sea. It is obvious that the technology to harvest the sea continues to improve. By the year 2050, experts believe that the problems to explore the food, minerals and energy resources of the sea will have been largely solved.
Why does the author mention a steamship?
选项 A、To illustrate that man can make use of sources of energy from the sea.
B、To show that a steamship is better than other kinds of ships.
C、To argue that man should use steamships.
D、To indicate that it is warmer in the ocean than on land.
答案A
解析 作者在文章中提到蒸汽船，就是为了说明人类可以利用很多种海洋资源。文章第四段说，除了石油和天然气，海洋还提供了很多新能源，接着就以蒸汽船为例证明这一点。
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