A
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 1,000 joggers and non-joggers for 12 years.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 5 miles per hour.The research suggests that people who jog more than three times a week or at higher speeds of over 7 mph 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 just unnecessary, and it may be harmful.”
The implications of this are that moderate forms of exercise such as tai 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.”
1.The underlined word “strenuous” in Paragraph 1 is closest in meaning to “ ”.
A.hard B.regular
C.practical D.flexible
答案:A
解析:词义猜测题。此处指像马拉松一样的锻炼,所以strenuous应与hard意思相近,表示“艰苦的,费力的”。regular“定时的”;practical“实用的”;flexible“灵活的”。
2.The author presents some figures in Paragraph 2 to .
A.suggest giving up jogging
B.show risks of doing sports
C.provide supportive evidence
D.introduce the research process
答案:C
解析:写作目的题。作者在第二段中采用了列数字的方法,是为了提供支持的证据,能更有力地说明第一段的研究结论。
3.According to the scientists, why is too much exercise harmful?
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.
答案:A
解析:细节理解题。根据第二段的最后两句“Thescientiststhinkthatthisisbecausestrenuousexercisecausesstructuralchangestotheheartandarteries.Overtime,thiscancauseseriousinjuries.”可知,剧烈运动会导致心脏和动脉结构发生变化,从而有损健康。
4.What can be inferred from the text?
A.Jogging is the best exercise.
B.More exercise means a healthier life.
C.Marathon runners are least likely to die.
D.Proper exercise contributes to good health.
答案:D
解析:推理判断题。根据最后两段可知,过度锻炼不仅没有必要,而且还可能有害,适当的锻炼会有助于健康。
