阅读理解。阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。
There are various reasons why cancers appear to be on the increa. For one thing, though their sufferers are to be found in all age groups, cancers are particularly likely to attack persons in their middle and advanced years. Naturally, since people live longer the years, there are more cancer sufferers than before. Again, with better methods of diagnosis (customary>四色性格诊断加拿大留学费用aos>经典爱情小说), doctors can more easily recognize cancerous growths that would formerly have pasd unnoticed or that would have been wrongly diagnod. It is also believed that certain habits and conditions of modem living, including heavy smoking and the pollution of the air, may leave people living in more cancer-causing conditions than before.kotoko
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We all look forward to the day when a simple medical test can find cancer while it is still small. Rearchers around the world are working on刘艺彬 such a test. Most of their work deals with the examination of the blood.ffo
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