问题 综合

下图所示是沿东经106.5°我国局部地形剖面图及气温、降水分布状况,读图并分析回答问题。

(1)写出图中字母代表的地形区名称:

A.____________(高原);C.____________(山脉);F.____________(盆地);G.____________(高原)。

(2)F地形区内,与同纬度地区相比,冬夏气温均______________(高、低),其主要原因是____________________________________________________________________________。

(3)从地质构造上看,B地形区属于________________。

(4)A地形区存在的主要生态环境问题是___________________________________________

______________________________________________________________________________。

答案

(1)黄土高原 秦岭 四川盆地 云贵高原

(2)高 盆地地形,冬季由于高山阻挡,受冬季风影响小,夏季热量难以扩散

(3)断层(或地堑)

(4)水土流失

根据106.5°E经过中国中部及图中各区地势高低可判断各地形区名称;四川盆地由于地形以及受冬季风影响小,夏季热量不易散失等原因而气温全年都高于同纬度地区。B为秦岭北侧渭河平原,是一断裂下陷平原区。

填空题
单项选择题

The differences in living standards around the world are vast In 1993, the average American had an income of about $25,000. In the same year, the average Mexican earned $7,000, and the average Nigerian earned. $1,500. Not surprisingly, this large variation in average income is reflected in various measures of the quality of life. Changes in living standards over time are also large. In the United States, incomes have historically grown about 2 percent per year (after adjusting for changes in the cost of living). At this rate, average income doubles every 35 years. In some countries, economic growth has been even more rapid. In Japan, for instance, average income has doubled in the past 20 years, and in South Korea it has doubled in the past 10 years.

What explains these large differences in living standards among countries and over time The answer is surprisingly simple. Almost all variation in living standards is attributable to differences in countries’ productivity—hat is, the amount of goods and services produced from each hour of a worker’s time. In nations where workers can produce a large quantity of goods and services per unit of time, most people enjoy a high standard of living; in nations where workers are less productive, most people must endure a more meager existence. Similarly, the growth rate of a nation’s productivity determines the growth rate of its average income.

The fundamental relationship between productivity and living standards is simple, but its implications are far-reaching. If productivity is the primary determinant of living standards, other explanations must be of secondary importance. For example, people might think that labor unions or minimum-wage laws contributed to the rise in living standards of American workers over the past century. Yet the real hero of American workers is their rising productivity.

The relationship between productivity and living standards also has great implications for public policy. When thinking about how any policy will affect living standards, the key question is how it will affect our ability to produce goods and services. To improve living standards, policymakers need to raise productivity by ensuring that workers are well educated, have the tools needed to produce goods and services, and have access to the best available technology.

The word "meager" in the second paragraph is closest in meaning to" () ".

A. modest

B. poor

C. meaningless

D. plentiful