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
Routine X-ray chest examination is not so dangerous______.