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  3. Air quality in Britain has improved considerably in the last 30 years. Total emissions of smoke in the air have risen by over 8

Air quality in Britain has improved considerably in the last 30 years. Total emissions of smoke in the air have risen by over 8

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问题    Air quality in Britain has improved considerably
in the last 30 years. Total emissions of
smoke in the air have risen by over 85 per cent        【1】______
since 1950. The domestic smoking control               【2】______
program has been particularly important in achieving                    
this result. London and other major cities are no      【3】______
longer have the dense smoke-laden "smogs" of the                    
1950s, but in central London winter sunshine has       【4】______
increased about 70 per cent since 1958.                【5】______
   Since 1990, daily air pollution data from the                    
British monitoring network has been made available     【6】______
to the public by the Department of the                              
Environment’s Air Quality Bulletins. These give the                     
concentrations of three main pollutants--ozone, nitrogen         
dioxide and sulfur dioxide -- and grade air quality                    
on a scale between "very weak" and "very               【7】______
good". The information features in television and                    
radio weather reports, appears in many national and    【8】______
local newspapers. Therefore, the data are available    【9】______
on a special free telephone number and on videotext                    
systems.                                                            
   A comprehensive review of the issue of urban                    
air quality was published in January 1992. Three                    
independent committees of which experts have been      【10】______
established to advise on different aspects of the problem,
and will set guidelines and targets for air quality.
The network is also being extended and up-
graded at a cost of ￡ 10 million.
【M9】
选项
答案将Therefore改为Moreover或Furthermore。
解析 根据上下文，我们可以知道这里要表示的是“递进关系”，因此要用moreover或furthermore。而there- fore则作“因此”讲，表示“结果”，例如；Love looks not with the eyes，but with the mind，and therefore is  winged Cupid painted blind．爱情不是用眼睛，而是用心灵去看的，所以长翅膀的爱神丘比特被画成了瞎子。Lies are essential to humanity．They are perhaps as important as the pursuit of pleasure and moreover are dictated by that pursuit．谎言对人类来说是必不可少的。它们也许如同追求快乐一样重要，而且是由这种追求所支配的。
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