His lack of professional knowledge ______for the failure of the experiment.      

试卷相关题目

• 1Once harm is _______ to the eco-system, all species will ________, including man himself.      

  A.made; be in danger

  B.done; be dangerous

  C.caused; be endangered

  D.done; be in danger

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• 2The accused woman _______ himself by saying that he killed the man totally out of self-defense andit was completely an accident.    

  A.guarded

  B.protected

  C.defended

  D.prevented

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• 3If you want to know more information about the Analytical Machine, ______ the followingWebsite: www.computer.net      

  A.see

  B.visit

  C.look for

  D.search

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• 4He wanted to ____ the National Team to compete in the Summer Olympic Games for his country but he was disappointed that he failed at the qualifying stage.      

  A.attend

  B.takepartin

  C.joinC.joinin

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• 5Oxygen usually ______ in the form of gas in nature but when made cold enough, it can also take the form of solid.     

  A.remains

  B.staysB.existsD.survives

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• 6The boy was sitting on the floor ______ by toys.  

  A.surrounded

  B.surrounding

  C.surroundings

  D.surround

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