2．If you think that running marathons will help you live a long and healthy life，new research may come as a shock．According to a recent scientific study，people who do a very strenuous workout are as likely to die as people who do no exercise at all．
Scientists in Denmark have been studying over 1，000joggers and non-joggers for 12years．The death rates from the sample group indicate that people who jog at a moderate pace two or three times a week for less than two and a half hours in total are least likely to die．The best speed to jog at was found to be about 5miles per hour．The research suggests that people who jog more than three times a week or at higher speeds of over 7mph die at the same rate as non-joggers．The scientists think that this is because strenuous exercise causes structural changes to the heart and arteries（动脉）．Over time，this can cause serious injuries．
Peter Schnohr，a researcher in Copenhagen，said，"If your goal is to decrease risk of death and improve life expectancy，jogging a few times a week at a moderate pace is a good strategy．Anything more is not just unnecessary，and it may be harmful．"
The implications of this are that moderate forms of exercise such as t'ai chi，yoga and brisk walking may be better for us than"iron man"events，triathlons and long-distance running and cycling．According to Jacob Louis Marott，another researcher involved in the study，"You don't actually have to do that much to have a good impact on your health．And perhaps you shouldn't actually do too much．"
29．The underlined word"strenuous"in Paragraph 1is closest in meaning to"A"．
A．hard B．regular C．practical D．flexible
30．The author presents some figures in Paragraph 2toC．
A．suggest giving up jogging B．show risks of doing sports
C．provide supportive evidence D．introduce the research process
31．According to the scientists，why is too much exercise harmful？A
A．It may injure the heart and arteries．
B．It can make the body tired out．
C．It will bring much pressure．
D．It consumes too much energy．
32．What can be inferred from the text？D
A．No exercise at all is the best choice．
B．More exercise means a healthier life．
C．Marathons runners are least likely to die．
D．Proper exercise contributes to good health．
分析 短文讲述了运动与健康的关系．研究表明，过量的运动和不做运动一样，都对身体不益，过量运动会伤及一个人的心脏和动脉，只有适当的运动才有益于身体健康．像太极，瑜伽之类的温和的运动方式会比三项全能，马拉松长跑等高强度的运动方式更适合人体的健康．
解答 29-32 ACAD
29．A 词义猜测题 hard 耗费体力的；regular 有规律的；practical 实际的；flexible 灵活的．根据文中people who do a very strenuous workout are as likely to die as people who do no exercise at all．可知do a very strenuous workout和 do no exercise 是相对的，所以应该选A．
30．C 推断题．文章第一段提出最近的研究结论，即过度锻炼与不锻炼的人死亡率一样高，第二段讲丹麦科学家们的实验，并列举出了一系列数据，来证明提出的论点．故正确答案为C．
31．A 细节题．由第二段最后两句"…this is because strenuous exercise causes structural changes to the heart and arteries（动脉）．Over time，this can cause serious injuries．"可知太剧烈的锻炼会引起心脏和动脉结构上的变化，随着时间增长，有可能导致严重的损伤．故正确答案为A．
32．D 推断题．文章最后告诉人们，"实际上，要改善健康并不需要做那么多．而且你其实很可能不应该做得过多．"，也就是说适当的锻炼才是对身体有好处的．故正确答案为D．
点评 做阅读时经常犯错的主要原因是，仅凭读过文章后残留在脑海中的一丝印象来勾选答案，这样便很容易掉入出题人故意设布下的题目陷阱．所谓阅读理解，对于题目的理解一定要忠实于原文，因此，每一道题都应该与原文作全面的对比与核查，再得出答案．也就是说，阅读理解的每一道题目，在原文都应该有明确的出处，我们把这一出处叫做原文相关句，（1）排除与原文相关句主题不一致的选项（2）排除与原文相关句态度相反的选项 （3）排除用于过于极端或负面的选项（4）注意结合文章主旨和主题去排除．
