阅读理解
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 say 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 (资源) to help mankind live on. Resources on land are beginning to grow less. The sea, however, still offers hope to supply many of man's needs.
The riches of the sea yet to be developed by man's technology are impressive. Oil and gas exploration have existed for nearly thirty years. Valuable amounts of minerals such as iron, copper and so on exist on the ocean floor, ready to be mined.
Fish farming promises to be a good way to produce large quantities of food. The culture of fish and shellfish is an ancient skill practiced in the past mainly by Oriental peoples.
Besides oil and gas, the sea may offer new sources of energy. Experts believe that the warm temperature of the ocean can be used in a way similar to the steam in a steamship. Ocean currents and waves offer possible use as a source of energy such as hydroelectric power.
Technology is enabling man to explore ever deeper under the sea. The new undersea technology is providing divers with diving suits and undersea chambers that are kept at sea-level pressure. The development of strong, new materials has made this possible.
The technology to harvest the sea continues to improve. By the year 2000, experts believe that the problems to exploit the food, minerals, and energy sources of the sea will be largely solved.
1.Why does the author mention a steamship?
[ ]
A.To express that man can make use of sources of energy from the sea.
B.To argue that man should use steamships more than other means of transportation.
C.To show that a steamship is better than other kinds of ship.
D.To show that it is warmer in the ocean than on land.
2.It can be inferred from the passage that ________.
[ ]
A.technology for exploring the sea has been solved.
B.in the near future man can live on the ocean floor.
C.planting rice in the sea will be made possible in a short time.
D.man hasn't completely developed the riches of the sea
3.According to the author, technology for exploring the sea is important because ________.
[ ]
A.it's a lot of fun diving into the sea
B.ancient people used to explore the sea
C.resorses on land are running short
D.man cannot travel farther into space
4.The word “harvest ”in the last paragraph could be replaced by ________.
[ ]
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