The term "smog" is the combination of two words: ______ and ______.

f widespread environmental damage for which it has been blamed. It forms when oxides of sulfur and nitrogen combine with atmospheric moisture to yield sulfuric and nitric acids, which may then be carded long distances from their source before they are deposited by rain. The pollution many also take the form. of snow or fog or be precipitated in dry forms. In fact, although the term "acid rain" has been in use for more than a century — it is derived from atmospheric studies that were made in the region of Manchester, England — the more accurate scientific term would be "acid deposition." The dry form. of such precipitation is just as damaging as the liquid form, especially to trees and structures. Furthermore, some of the pollutants also associated with acid rain are not themselves acidic.

The problem of acid rain may be said to have originated with the Industrial Revolution, and it has been growing ever since. The severity of its effects has long been recognized in local settings, as exemplified by the spells of acid smog in heavily industrialized areas. The wide destructiveness of acid rain, however, has come to be realized only in recent decades. One large area that has been studied extensively is northern Europe, where acid rain has eroded structures, injured crops and forests, and threatened or depleted life in freshwater lakes. In 1983, for example, published reports indicated that 34 percent of the forested areas of West Germany had been damaged by acid rain. The northeastern U.S. and eastern Canada have also been affected by this form. of pollution, and other areas of the two countries are also showing increasing signs of damages, as are other regions of the world.

Industrial emissions have been blamed as the major cause of acid rain. Because the chemical reactions involved in the production of acid rain in the atmosphere are complex and as yet little understood, industries have tended to challenge such assessments and to stress the need for further studies; and because of the cost of pollution reduction, governments have tended to support this attitude. Studies released by the U.S. government in the early 1980s, however, strongly implicated industries as the main source of acid rain.

Part A

Directions: Read the following four texts. Answer the questions below each text by choosing A, B, C or D. (40 points)

Acid rain, which is a form. of' air pollution, currently becomes a subject of great debate because of widespread environmental damage for which it has been blamed. It forms when oxides of sulfur and nitrogen combine with atmospheric moisture to yield sulfuric and nitric acids, which may then be carried long distances from their source before they drop in the form. of rain. The pollution may also take the form. of snow or fog or fall down in dry forms. In fact, although the term "acid rain" has been in use for more than a century—it is derived from atmospheric studies that were made in the region of Manchester, England—the more accurate scientific term would be' acid deposition. The dry form. of such deposition is just as damaging to the environment as the liquid form.

The problem of acid rain originated with the Industrial Revolution, and it has been growing ever since. The severity of its effects has long been recognized in local settings, as exemplified by the spells of acid smog in heavily industrialized areas. The widespread destructiveness of acid rain, however, has become evident only in recent decades. One large area that has been studied extensively is northern Europe, where acid rain has eroded structures, injured crops and forests, and threatened life in freshwater lakes. In 1984, for example, environmental reports indicated that almost half of the trees in Germany's Black Forest had been damaged by acid rain. The northeastern United States and eastern Canada have also been particularly affected by this form. of pollution; damage has also been detected in other areas of these countries and other regions of the world.

Industrial emissions have been blamed as the major cause of acid rain. Because the chemical reactions involved in the production of acid rain in the atmosphere are complex and as yet little understood, industries have tended to challenge such assessments and to stress the need for further studies; and because of the cost of pollution reduction, governments have tended to support this attitude. Studies released by the US government in the early 1980s, however, strongly indicated industries as the main source of acid rain, in the eastern US and Canada.

From the first sentence of the passage, we learn that______

A．acid rain has caused air pollution

B．acid rain has caused widespread environmental damage

C．acid, rain has become a much studied subject

D．acid rain travels in all directions before it rains down

光化学烟雾(photochemical smog)

Smog does great harm to the respiratory system.

A．Y

B．N

C．NG

Smog is a blended word. ()

The word“smog”first appeared in 1952．

A．Right

B．Wrong

C．Not mentioned