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发布时间: 1970-01-01

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1最佳选择题 3分

Despitethefactthattodayviruses病毒areknowntocausecan

  • A. viruses are known to cause cancer in animals
  • B. at present, human cancer is not believed to be contagious (传染的)
  • 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 do not vary greatly from species tn species
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2最佳选择题 3分

Despitethefactthattodayviruses病毒areknowntocausecan

  • A. the fact that viruses have been known to mutate
  • B. the fact that a cancer-immune individual may lose 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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3最佳选择题 3分

Despitethefactthattodayviruses病毒areknowntocausecan

  • A. they are innocuous agencies
  • B. they are the causative agents of most human cancer
  • C. they seem to be infections to many people
  • D. they are generally thought to be relevant to most cancer in man
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4最佳选择题 3分

Despitethefactthattodayviruses病毒areknowntocausecan

  • 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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