2. 外语
  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. which form of lung cancer is a common one
People are still not sure______.
选项
答案C
解析 由文章第一段第三句的内容可知，有很多原因可以导致肺癌，但关于最主要的原因仍存在争论，故选C。
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