根据下面材料，回答题。ExerciseLowersEmployers'HealthCostCompaniescansavemillionsin

共享题干题根据下面材料，回答题。 Exercise Lowers Employers' Health Cost Companies can save millions in health-care costs simply by encouraging their employees to exercise a little bit, researchers reported on Friday. They said obese (肥胖的) employees had higher health-care costs, but lowered those expenses by exercising just a couple of times a week, without even losing any weight.Feifei Wang and colleagues at the University of Michigan studied 23,500 workers at General Motors. They estimated that getting the most sedentary (惯于久坐的) obese workers to exercise would have saved about $790,000 a year, or about 1.5 percent of health-care costs for the whole group,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 exercise, at least 20 minutes of exercise or workhard 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 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.1.[不定向选择题]How often should the employees exercise to help lower the health-care costs?A.At least seven days a wee B.At least twenty minutes a wee C.At least twice a wee D.At least once a wee 2.[不定向选择题]For which group of the workers were the health-care costs the highest?A.The employees of normal weigh B.The overweight employee C.The obese employee D.The sedentary obese employee

1.参考答案：C
参考解析：细节题。题干：员工如何通过经常锻炼来降低医疗费用?文章第二段和第八段分别提到，每周至少锻炼两次就有助于减少医疗开支。?
2.参考答案：D
参考解析：细节题。题干：哪一类员工的医疗费用最高?利用题干关键词可以定位到文章的第六段和第七段，可以看出肥胖而又不锻炼的员工医疗费用最高。?3.[不定向选择题]By encouraging its employees to exercise, General Motors could saveA.$790,000 per year B.$7.1 million per year C.$3,000 per year D.$7,300 per year

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