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    7、In the past, the man didn’t have to think about the protection

    76. _________

    of his environment. There used to be many people on earth，

    77. _________ 

    but natural material resources seemed to be unlimited.  

    78. ___      

    Today things are different . The world become too crowded.   

    79. _________ 

    We are use our natural materials too quickly. At the same time,

    80. _________

    we keep polluting our environment from dangerous chemicals.  

    81. ________

    Dustbins are filled up with cans and bottles that once holds

    82. ________

    beer, coffee or Coca-Cola. Everywhere peoples are always

    83. ________

    throwing away wrappings from food or clothes and all kinds

    84. ________

    of unwanted things, some of things are difficult to get rid of.

    85. ________

    7、76. 去掉the                                                      77. many 改为few  

    78. but 改为and                                                79. become 前加has   

    80. use 改为using                                             81. from 改为with  

    82. holds 改为 held                                          83. peoples 改为 people

    84.√                                                               85. things 改为which

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    In the past, the man didn’t have to think about the protection

    76. _________

    of his environment. There used to be many people on earth，

    77. _________ 

    but natural material resources seemed to be unlimited.  

    78. ___      

    Today things are different . The world become too crowded.   

    79. _________ 

    We are use our natural materials too quickly. At the same time,

    80. _________

    we keep polluting our environment from dangerous chemicals.  

    81. ________

    Dustbins are filled up with cans and bottles that once holds

    82. ________

    beer, coffee or Coca-Cola. Everywhere peoples are always

    83. ________

    throwing away wrappings from food or clothes and all kinds

    84. ________

    of unwanted things, some of things are difficult to get rid of.

    85. ________

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