C.provide supportive evidence
D.introduce the research process
答案:C 考查写作目的。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 考查细节理解。根据第二段的最后两句“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”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.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.
答案:D 考查推理判断。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。
1.scientific adj. 科学的2.sample n. 样品;抽样
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