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    四级考试网 鲤鱼小编 更新时间:2017-05-27

    Word came from California of a new weapon in the war on household pests.
    Two scientists work for a firm in California developed 1.__________  
    a new method to eliminate insects with using dangerous chemicals.2.__________  
    The new weapon—hot air.The basic idea is that 
    insect pests can adjust to temperature much above normal.3.__________  
    In laboratory experiments,cockroaches and termites can’t survive 
    much more than a quarter of hour at 100 degrees 4.__________  
    Fahrenheit or about fifty degrees centigrade. The new method involves 
    covering a house with a huge tent,and fill it with air heated to 5.__________ 
    around 65 degrees centigrade.
    Hot air is forced in with fans and the tent keeps the heat inside the house.
    Although termites try to escape by hiding in wood beams,6.__________ 
    the heat treatment must be continued by four to six hours. 7.__________ 
    But when it's all over and the insects are dead,
    there are no toxic residues to danger humans or pets,and no 8.__________ 
    funny smells.Scientists claim that there's no danger of fire too.9._________
    Since very few household, materials will burn at 65 degrees centigrade. In fact, wood is prepared for construction use by drying
    in the ovens at 100 degrees centigrade, that is substantially hotter. 10._________
     参考答案:
    1. work → working 
    2. with → without 
    3. can adjust → can not adjust 
    4. hour → an hour 
    5. fill → filling 
    6. Although → Since 
    7. by → for 
    8. danger → endanger
    9. too → either
    10. that → which
     

     

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