Besides an early death from cancer or heart disease, smoking can cause lung disorders. People who smoke over a pack a day have almost three times the risk of contracting pneumonia (肺炎) than that of non­smokers. By lowering levels of estrogen (雌性激素) in men and women, smoking speeds bone less. If a woman smokes a pack of cigarettes every day, she will enter menopause (更年期) with 5% to 10% less bone mass than a non­smoker.

　　The good news is that no matter what your age is or how long you’ve smoked, you’ll live longer if you quit today. The Coronary Artery Surgery Study examined nearly 2,000 long­term smokers over the age of 54. Those who quit had significantly lower death rates six years later than those who didn’t. Even the oldest ex­smokers had a higher survival rate.

　　Not only will you live longer if you quit, but you’ll feel better, breathe easier, and find that you have more energy. You’ll have fewer respiratory infections, headaches, and stomachaches. What’s more, you’ll save money. Your clothes and breath won’t smell unpleasant any longer. And your habit won’t annoy, or threaten the health of the people who live and work with you.

　　1．According to the passage, the percentage of deaths due to smoking is ________.

　　A．20%　B．25%

　　C．29%

　　D．87%

　　．All of the following methods are used in the passage EXCEPT ________.

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