Passage Two
　　 Questions 61 to 65 are based on thefollowingpassage．
　　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(硫) and nitrogen(氮)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 northernEurope，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 northeastem United States and eastern Canada have also been Darticularly affected by this form of pollution．Damage has also been detected in other areas of these countries and other regions of the world．
　　Industial emissions have been blamed as the maj or 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 USA government in the early 1980s，however，strongly indicated industries as the main source of acid rain，in the eastern USA and Canada．
　　61．From the first sentence of the passage，we Iearn 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
　　62．According to the passage，acid fog_____．
　　A．falls down when the atmosphere is moist
　　B．is not as frequent as acid rain
　　C．often falls in the region of Manchester,England
　　D．is as damaging as acid rain
　　63．The second paragraph is mainly about_____．
　　A．the origin of acid rain
　　B．the cause of acid rain
　　C．the formation of acid rain
　　D．the widespread damage of acid rain
　　64．Why is acid rain liRle understood?
　　A．Because it is a new phenomenon．
　　B．Because it is not frequent enough．
　　C．Because its formation is complex．
　　D．Because it is difficult to study it．
　　65．According to the passage，Governments__________．
　　A．deny that industries causes acid rain
　　B．admit that they are only partly responsible
　　C．claim that they are the main sources of pollution
　　D．think that the cause of acid rain needs further study

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