Man is a land animal, but he is also closely tied to the sea.Throughout history the se

a 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 technology 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 2050, experts believe that the problems to explore the food,

minerals and energy resources of the sea will have been largely solved.

26.What is the proper title for the passage______

A.Needs of Man

B.Sea Harvest and Food

C.Sea and Sources of Energy

D.Sea Exploring Technology

27.It can be inferred from the passage that______

A.man hasn’t completely made use of the riches of the sea

B.technology for exploring the sea has been solved

C.harvesting rice in the sea will be made possible

D.in the near future man can live on the ocean floor

28.Why does the author mention a steamship______

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

29.According to the author, technology is important because______

A.resources on land are running short in ten years

B.man can use it to explore the deeper sea

C.it is a lot of fun diving into the sea

D.ancient people used it to explore the sea

30.According to the author, when will the problems to explore the deeper sea largely be solved______

A.In the next generation

B.By the end of the 20th century

C.In the near future

D.By the middle of the 21st century