Company-wide．the potential savings could reach$7 1 million per year，they reported in the Journal of Occupational and Environmental Medicine

　　Of the whole group of workers．about 30 percent were of normal weight，45 percent were overweight(超重的)，and 25 percent were obese．Annual health-care 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，health-care costs went up by at least$100 a year，and were$3．000 a year for obese employees who were sedentary

　　But adding two or more days of light exerciseat least 20 minutes of exercise or work hard enough to increase heart rate and breathinglowered costs by on average$500 per employee a year，the researchers found.

　　This indicates that physical activity behavior could reduce at least some of the harmful effects of excess body fat，and in consequence，help lower the health-care costs，Wang and colleagues wrote．

　　31 How can employees help lower the health-care costs?

　　A By taking more rest

　　B By eating less．

　　C By exercising a little bit．

　　D By saving more money．

　　32 By encouraging its employees to exercise General Motors could save

　　A$790，000 per year．

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