急性脊髓炎最常累及的脊髓节段是（）. A．颈1～4  B．颈5～8  C．胸2～5

术前检查中对于把握手术适应证以及选择手术方法有重要意义的项目是

A．动脉造影检查

B．阶段性肢体血压测定

C．X线摄片

D．放射性核素检查

E．电阻抗体积描记法检查

我国唯一的蝮蛇保护区蛇岛位于( )。

A．大连海滨

B．青岛海滨

C．厦门海滨

D．三亚海滨

言语謇涩的病因多为（）。

A.心气大伤

B.心气不足

C.痰火扰心

D.风痰阻络

E.热扰心神

多普勒变宽

Within 80 years, some scientists estimate, the world must produce more than eight times the present world food supply. The productiveness of the sea raises our hopes for an adequate food supply in the future. Aided by men of science, we have set forth to find out that 70 percent of the earth remains unexplored--the ocean depths. Thus, we may better discover and utilize the sea’s natural products for the world’s hungry.

It is fish protein concentrate that is sought from the seas. By utilizing the unharvested fish in United States waters alone, enough fish protein concentrate can be obtained to provide supplemental animal protein for more than one billion people for one year at the cost of less than half a cent per day per person. The malnutrition of children is terribly tragic. But the crime lies in society’s unrestrained breeding, not in its negligence in producing fish powder. But wherever the population projects are carefully considered, the answer to the problem is something like this: There are few projects that could do more to raise the nutritional level of mankind than a full-scale scientific effort to develop the resources of the sea. Each year some thirty million tons of food products are taken from the sea, which account for 12 percent of the world’s animal proteins. Nations with their swelling populations must push forward into the sea frontiers for food supplies. Private industry must step up its marine research and the federal government must make new attacks on the problems of marine research development. There is a tone of desperateness in all these designs on the sea.

But what is most startling is the assumption that the seas are an untouched resource. The fact is that the seas have been, and are being, hurt directly and indirectly, by the same forces that have abused the land. In the broad pattern of ecological relationships the seas are not separable from what happens on the land. The poisons that pollute the soil and the air bring in massive doses into the "continental shelf" waters. The dirt and pollution that spills from our urban sewers and industrial out falls despoil our bays and coastal waters. All the border seas are already heavily polluted by the same exploitation drives that have undermined the quality of life on land.

The author of the text is most probably of the opinion that（）

A. the sea is an inexhaustible resource of food supply

B. the shortage o{ food supply mainly results from unrestricted population growth

C. the inadequate food supply is chiefly caused by the negligence in exploration of the sea

D. it is the population projects, rather than the development of sea resources, that can improve the nutritional conditions of mankind