[填空题]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______.

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[单项选择]Cancer cells destroy not only all rival cells, in their ruthless biological warfare, but also destroy the larger organization—the body itself—signing their own suicide warrant.（　）
A. refined
B. random
C. merciless
D. perpetual

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[简答题]S2. In general, cancer cells divide at a higher rate than do normal cells, but the distinction between the growth of cancerous and normal tissues is not so much the rapidity of cell division in the former as it is the partial or complete loss of growth restraint in cancer cells and their failure to differentiate into a useful, limited tissue of the type that characterizes the functional equilibrium of growth of normal tissue.

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Cancer is a disease in which cells multiply without control, destroy healthy tissue, and endanger life. About 100 kinds of cancer attack human beings. The disease is a leading cause of death in many countries. In the United States and Canada, only diseases of the heart and blood vessels kill more people. Cancer occurs in most species of animals and in many kinds of plants, as well as in human beings.
2. Cancer strikes people of all ages but especially middle-aged persons and the elderly. It occurs about equally among people of both sexes. The disease can attack any part of the body and may spread to other parts. However, the parts most often affected are the skin, the digestive organs, the lungs, the male prostate, and the female breasts.
3. Scientists do not know exactly why cancer develops. Most experts agree that people deve

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