Of the whole group of workers, about 30 percent were of normal weight, 45 percent were overweight, and 25 percent were obese. Annual health­care costs averaged $2,200 for normal weight, $2,400 for the overweight, and $2,700 for obese employees. But among workers who did no exercise, health­care costs went up by at least $100 a year, and were $3,000

　　a year for obese employees who were sedentary (久坐的)．

　　But adding two or more days of light exercise — at least 20 minutes of exercise or work hard enough to increase heart rate and breathing — lowered costs by on average $500 per employee a year, the researchers found. “This indicates that physical activity behavior could lessen at least some of the negative effects of excess body fat, and in consequence, help lower the increasing health­care costs，” Wang and his colleagues wrote.

　　语篇解读：本文是一篇记叙文。公司要降低保健方面的费用，那就应该大力提倡员工多花时间锻炼身体。

　　8．The

　　researchers believe companies can spend far less on health­care costs by________.

　　A．encouraging employees to lose weight

　　B．limiting the number of obese employees

　　C．persuading employees to do physical activities

　　D．limiting the employment of sedentary workers

　　解析：选C　细节理解题。根据第一段第一句可知，公司要想在保健方面减少支出，就得鼓励员工多锻炼。故C项正确。

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