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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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