单选题
Cancer is considered a modern disease, though it was not unknown in ancient times.(The condition was named by the Greeks from their word for crab, presumably because of its clawing, crablike growth). The incidence of cancer has risen dramatically in recent decades, primarily【C1】______cigarette smoking, and cancer is probably our most dreaded disease today. As a cause of death in the United States, cancer has climbed from less than 6 percent of all deaths in 1900 to over 20 percent today,【C2】______recent statistics. It is already the leading killer of women aged thirty to fifty-four. And add a killer of the overall population, it is second only to heart disease,【C3】______close to 430,000 deaths per year. This figure has risen annually since 1949, and if percent trends continue, cancer may well overtake heart disease as the number one cause of death. Can We Fight Cancer More Effectively Today? Although there is still much to be learned about cancer, our knowledge of the disease has grown steadily in recent years. We have a better understanding of the disease and are finding ways to【C4】______it. Early recognition of the signs of cancer, prompt diagnosis, and aggressive treatment by the appropriate means have made the word cancer less【C5】______than it used to be. Even people with forms of cancer that are still difficult to treat know that current techniques may【C6】______them to outwit the disease until improved treatment becomes available. Many cancer victims have hope where there was once despair. Even more important is the fact that some kinds of cancer are【C7】______caused by preventable factors—for example, 25 to 30 percent of all cancer deaths are related to cigarette smoking, and most skin cancer is caused by【C8】______exposure to the sun. Not all forms of cancer have such obvious associations, but where risk factors have been【C9】______. we can use this knowledge and attempt to reduce the odds of developing those particular forms of disease. You and the people you know can【C10】______your cancer risk as individuals.