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Air pollution comes from factories, power stations or cars.                  71. ________
Chemicals in the smoke from power stations cause a lot of                             72. ________
damage. They can travel hundred of miles in the wind before                  73. ________
falling to the ground in the rain. But this ¡°chemical rain¡± gradual            74. ________
destroys trees in the forests and kill fish in the lakes. In Germany,           75. ________
over 50% of the country¡¯s trees had damaged by the year 1986.           76. ________
Time and time again there are serious accidents pollute the                   77. ________
air. In 1986 there was a bad accident at a nuclear power station in the          78. ________
Russia. A cloudy of radiation crossed the whole of Europe. It is said           79. ________
that 125,000 people died in Russia as a result of illnesses causing       80. ________
by this accident.


71. or¡úand           72. ¡Ì          73. hundred¡úhundreds    
74 gradual¡úgradually    75. kill¡úkills   76. hadºó¼Óbeen  
77.accidenºó¼Óthat/which 78. È¥µôthe   79. cloudy¡úcloud   80. causing¡úcaused

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