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 第一段第三句说可能有许多原因,但什么是最主要的仍有争论。选项C中的responsible for在医学文献中常用来指某病的原因。
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