Text 3

Under certain circumstances, the human body must cope with gases at greater-than-normal atmospheric pressure. For example, gas pressures increase rapidly during a dive made with scuba gear because the breathing equipment allows divers to stay underwater longer and dive deeper.

The pressure exerted on the human body increases by 1 atmosphere for every 10 meters of depth in seawater, so that at 30 meters in seawater a diver is exposed to a pressure of about 4 atmospheres. The pressure of the gases being breathed must equal the external pressure applied to the body, otherwise breathing is very difficult. Therefore all of the gases in the air breathed by a scuba diver at 40 meters are present at five times their usual pressure. Nitrogen, which composes 80 per cent of the air we breathe, usually causes a balmy feeling of well-being at this pressure. At a depth of 5 atmospheres, nitrogen causes symptoms resembling alcohol intoxication, known as nitrogen narcosis. Nitrogen narcosis apparently results from a direct effect on the brain of the large amounts of nitrogen cause under these pressurized helium does not exert a similar narcotic effect.

Part B

52. Directions:

A) Title: Unemployment

B) Your composition should be based on the Outline given in Chinese below:

1. 下网被视为目前中国面临的头号问题。

2. 政府已采取了一系列措施来解决这一问题。

3. 随着政府和社会的共同努力，我们相信一定能解决下网问题。

You should write about 160 -200 words neatly on ANSWER SHEET Ⅱ.

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Part A

51. Directions:

You are preparing to ask for some help from your teacher, write a letter that:

1) detail what you want him or she does for you,

2) express your thanks to your teacher,

You should write about i00 words on ANSWER SHEET II. Do not sign your own name at the end of the letter. You do not need to write the address.

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Part C

Directions: Read the following text carefully and then translate the underlined segments into Chinese. Your translation should be written clearly on ANSWER SHEET Ⅱ.

46) Economic growth involves increases over time in the volume of a country's per capita gross national product (GNP) of goads and services. Such continuing increases can raise average living standards substantially and provide a stronger base for other policy objectives. 47) It is only in the last two centuries that continued growth in living standards has been realized for a number of now—developed countries, and this process has broadened in the 20th century to include a number of developing countries. 48) However, the fairly steady expansion in the third quarter of the 20th century gave way to a period of slower and more erratic growth for both- high-and low-income countries, while some of the economically poorest countries were thus far unable to establish a serf-sustaining pattern of development. It also became increasingly evident that there were serious environmental problems associated with some types of growth in production. In examining the record of economic growth and development, economists offer some explanations for the changes involved, and the attempts by governments to plan these changes. Five major issues are involved.

The first is why economic growth occurs more quickly in some countries and periods than in others. It is the increase in the size and quality of the factors of production that underlies growth, but certain forces deserve special attention. A variety of models of economic growth give expression to the understanding of these forces. Increasing attention has been paid in these models and in policy to the international aspects of growth. This trend is partly a reflection of the growing internationalization of economic activity. It also reflects a number of potentially destabilizing changes in the international economy that became evident during the 1970s.

49) A second issue is the challenges facing the low-income countries, namely, to move from subsistence levels of per capita income to a level that would generate self-sustaining growth and also to reduce the gap between themselves and the higher-income countries. A third issue, productivity, is central to changes in living standards and to-the analysis of international competitiveness.

A fourth major issue is the attempt to maintain growth and increase development through economic planning. 50)Planning became a widespread phenomenon during and just after World War Ⅱ and was given further emphasis in many newly independent countries that were industrializing. Beginning in the 1970s the emphasis shifted to more decentralized planning, with deregulation and privatization of industry as two aspects of this process.

Underlying economic growth and planning is a fifth issue, the attempt to predict economic activity. Modern forecasting involves a variety of computer-based techniques at the level of the firm, the country, and the international economy. The accuracy of forecasting has been reduced by increased uncertainty in the global and national economies since the early 1970s.

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P

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