2. 自考
  3. A. before the cancer cells spread elsewhere B. the more chances of dying of X-ray radiation he will have C. what is most respons

A. before the cancer cells spread elsewhere B. the more chances of dying of X-ray radiation he will have C. what is most respons

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问题 A. before the cancer cells spread elsewhere
B. the more chances of dying of X-ray radiation he will have
C. what is most responsible for lung cancer
D. as some people imagine
E. the more chances of getting lung cancer he will have
F. Bronchogenic carcinoma
People are still not sure______.
选项
答案C
解析 根据文章第1段第3句后半句“still controversial which are most blameworthy”可知，对于造成肺癌的最主要原因至今仍有争论。故本题选C项。
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