军队职称英语真题汇编-C阅读理解82

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• 1Cancer should be considered to be a biological problem rather than a medical one because（　）。

  A.viruses are knownto cause cancer in animals

  B.atpresent, human cancer is not believed to be contagious

  C.there are many known causes for the transformationof a normal cell to a cancer cell

  D.results of experiments on plants and animals do not vary greatly fromspeciesto species

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• 2The possibility that a virus causes human cancer is indicated by（　）。

  A.the fact that viruses have been knownto mutate

  B.the fact that a cancer-immune individual may lose his immunity

  C.he fact that production of human cancer cellsmight be due to a genetic factor

  D.the fact that man is host to many viruses

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• 3Many people believe hat viruses cannot possibly be of importance in human cancer because（　）。

  A.they are innocuous agents

  B.hey are he causative agents of most human cancer

  C.they seem t be infectious to many people

  D.they are generally thought to be relevant to most cancer in man

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• 4The best title for this passage is（　）。

  A.New Lightonthe Cause of Cancer

  B.The Newest Theory an the Nature of Viruses

  C.Viruses and Cancer

  D.On the Nature of life

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• 5According lo the passage, cancer cells are（　）。

  A.similar to the cell of origin

  B.mutations of viruses

  C.unable u reproduce

  D.among the smallest cell known

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