第一节(共10个小题；每小题2.5分，满分25分)
阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。
A
(2016·太原第二学段测评)Companies can save millions in healthcare costs simply by encouraging their employees to exercise a little bit.Researchers report that obese employees have higher healthcare costs，but they can lower those expenses by exercising just a couple of times a week—without even losing any weight.
