Ⅰ.阅读理解
Whether it’s to help their dogs or themselves,about half of all Americans surveyed in a recent poll(民意测验) say they exercise regularly.According to the poll,most people walk for exercise a few times a week.About a third say they walk every day.
But are they kidding themselves to think a walk is really helping them?Should we all be running or jogging if we want to count that activity as good for us?Dr.Tim Church,who studies the effects of physical activity at Louisiana State University’s Pennington Biomedical Research Center,made a study about that.
Church headed a study with 464 postmenopausal(绝经后的) women who,for six months,came into the lab to walk a treadmill(跑步机) while researchers watched.
