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  3. The modern world could not operate without roads. It is a way of life with almost every family in the western world owning an

The modern world could not operate without roads. It is a way of life with almost every family in the western world owning an

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问题     The modern world could not operate without roads. It is a way
of life with almost every family in the western world owning an
automobile. In Australia alone, billions of dollars are spending on      【M1】 ______
road maintenance and enhancements each year, such as new                                                
bridges and the highway development.  Highways are the public’s          【M2】 ______
main source of transportation to reach other, towns and cities with                                 
the increased speed limits to make traveling slower. In contrast,        【M3】 ______                  
town roads are designed for short travel with many streets and sharp                                 
turns to negotiate in slower speeds and for the pedestrians to cross at  【M4】 ______                     
convenient places like traffic lights. Research studies in the United                                    
Kingdom, Australia, the United States have shown that human              【M5】 ______                     
issues contribute to 95 % of accidents, road factors only to about                                          
one fifth of that percentage and vehicle factors for fewer than 5%.      【M6】 ______
    With road improvements speed has been allowed to raise,              【M7】 ______
except for special reasons like school and residential areas which       【M8】 ______
the limit has been lowered. Current speed limits are necessary. The               
speeds on normal roads in Australia ranging from 40km/h to               【M9】 ______
110km/h which is due to the series of road situations.                                      
Specialization of motor vehicles is a very common process which                     
allows the driver to enhance his/her automobile to obtain the                          
desired appearance or performance ability.  It is only when this                     
process gets out of control when the driver becomes a risk.              【M10】______
【M6】
选项
答案for改成to
解析 固定搭配。contribute to sth．是常用短语，上文的95%，about one fifth…与fewer than 5%属平行结构，都与contribute搭配，故将for改成to。这里还应注意one fifth的分数表达法。
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