C．alone

　　D．aware

　　Ⅲ.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，

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