| 阅读理解 |
| A new study shows that even low levels of weekly exercise have major health benefits. In the study, 30 minutes of walking three days per week was enough to drive down blood pressure and improve overall fitness in a group of healthy sedentary (久坐的) adults. For optimum(最佳的)health, adults are currently recommended to engage in 30 minutes of moderate(适度的)exercise for at least five days of the week. But few people achieve this level of weekly activity, often citing lack of time as the reason. Dr. Mark A. Tully, of the University of Ulster, Northern Ireland, and his colleagues designed a study to see if exercising at a level lower than currently recommended would improve overall fitness and heart health. A total of 106 healthy but sedentary adults between the ages of 40 and 61 participated in the 12week study. The subjects were randomly (随机地) assigned a 30minute walk 3 days per week (44 subjects) or a 3minute walk 5 days per week (42 subjects), while the remainder did not change their lifestyle(the nonwalking control group). After 12 weeks, Tully’s team found that blood pressure fell and waistlines and hiplines (臀围) reduced in size significantly in both the 3day walkers and 5day walkers. Overall fitness also increased in both walking groups. In contrast, no changes occurred in the nonwalking control group. The experts noted that the degree of positive change in blood pressure and waist and hip size seen in the 3day and 5day walkers is enough to make a difference to an individual’s risk of heart disease. "These results may encourage people who feel they do not have time to exercise for 5 days each week to consider finding time to do a lower weekly target of exercise," Tully and his colleagues concluded. |
| 1. What's the main purpose of the article? |
| A. To encourage people to do some exercise, even at a low level. B. To encourage people to do as much exercise as possible. C. To remind sedentary adults to do some exercise. D. To tell people how to improve overall fitness. |
| 2. Why only few people can do 30minute exercise for five days of the week? |
| A. They can't find the time. B. They will be too tired. C. They will have heart attacks. D. The level of the exercise is too high for them. |
| 3. Which of the following is WRONG about the study? |
| A. The participants are all healthy but sedentary adults. B. The participants are all over 40 years old. C. The participants do a 30minute walk 3 days a week and a 3minute walk 5 days a week in every two weeks. D. Both the 3day walkers and 5day walkers improved their health conditions. |
| 4. What can we infer from the fifth and sixth paragraphs? |
| A. Walking can drive down blood pressure. B. Even a low level of exercise in a week can improve one's heart health. C. Walking can improve one's heart health. D. Walking can make a difference to people’s heart. |