军队职称英语真题汇编-阅读理解34

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

  A.viruses are known to cause cancer in animals

  B.at present, human cancer is not believed to be contagious

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

  D.results of experiments on plants and animals d not vary greatly from species tospecies

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

  A.the fact that viruses have been known to mutate

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

  C.the fact that production of human cancer cells might be due to a genetic factor

  D.the fact that man is host to many viruses

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

  A.they are innocuous agents

  B.they are the causative agents of most human cancer

  C.they see tobe infectious to many people

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

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

  A.New Light on the Cause of Cancer

  B.The Newest Theory on the Nature of Viruses

  C.Viruses and Cancer

  D.On the Nature of life

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

  A.similar to the cell of origin

  B.mutations of viruses

  C.unable to reproduce

  D.among the smallest cell known

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