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
Routine X-ray chest examination is not so dangerous______.

选项

答案D

解析 根据文章第3段最后一句“Modern X—ray machines…such slight danger…that this would bemuch more than offset…”可知,熟练操作X射线仪器的人员给病人做胸透时造成的危害非常微小,以致能被发现肿瘤后及时治疗带来的益处大大抵消,所以D项正确。
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