[单项选择] Premature Smoking: A Serious Problem The third report on smoking and health from the Royal College of Physicians, which was published this month, contains important new sections on the smoking habits of children and the possible effect, on their future health. These include a twenty fold in the increase in the risk of lung cancer in heavy smokers and an increase of about three and a half times in the risk of dying from coronary(冠状的) heart disease; chronic(慢性的) oronchitis (支气管炎) and emphysema(肺气肿) are also much commoner. Teachers play an important part in determining the attitude of children to smoking, whether or not the children start to smoke, and in providing knowledge about the consequences of smoking. Whenever I see children of school age openly smoking in public, I wonder whether they really understand what they are doing. Probably most do not. I at least know that my clinical practice in lung disease will not be short of patients for the res
A. run a twenty-to-one risk of contracting lung cancer
B. are most certain to suffer from one or more of lung and heart complaints
C. are more prone than other people to certain lung complaints
D. many run more risk of contracting certain lung and heart disease